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Chemistry
Basics of Organic Chemistry
Previous Years Questions

MCQ (Single Correct Answer)

Given below are two statements : Statement I : Tropolone is an aromatic compound and has $$8 \pi$$ electrons. Statement II : $$\pi$$ electrons of $$ >...
Among the following compounds, the one which shows highest dipole moment is
Thin layer chromatography of a mixture shows the following observation: The correct order of elution in the silica gel column chromatography is...
The decreasing order of hydride affinity for following carbocations is: Choose the correct answer from the options given below:...
Using column chromatography, mixture of two compounds 'A' and 'B' was separated. 'A' eluted first, this indicates 'B' has
The correct IUPAC nomenclature for the following compound is: ...
The descending order of acidity for the following carboxylic acid is- A. $$\mathrm{CH}_{3} \mathrm{COOH}$$ B. $$\mathrm{F}_{3} \mathrm{C}-\mathrm{COOH...
From the figure of column chromatography given below, identify incorrect statements. A. Compound 'c' is more polar than 'a' and 'b' B. Compound '$$\m...
Resonance in carbonate ion $$\left(\mathrm{CO}_{3}{ }^{2-}\right)$$ is Which of the following is true?...
Match items of column I and II .tg {border-collapse:collapse;border-spacing:0;width: 100%} .tg td{border-color:black;border-style:solid;border-width...
Match List I with List II: .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-famil...
Which of the following conformations will be the most stable?
The correct order in aqueous medium of basic strength in case of methyl substituted amines is :
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R Assertion A : Benzene is more stable than hypothe...
Which will undergo deprotonation most readily in the basic medium? ...
Given below are two statements. Statement I : The compound is optically active. Statement II : is mirror image of above compound A. In the light of ...
Arrange the following in increasing order of reactivity towards nitration A. p-xylene B. bromobenzene C. mesitylene D. nitrobenzene E. benzene Choose ...
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R Assertion A : Thin layer chromatography is an ads...
Match List - I with List - II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-f...
Among the following marked proton of which compound shows lowest $$\mathrm{pK}_{\mathrm{a}}$$ value?
Match List - I with List - II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-f...
Given below are two statements: one is labelled as Assertion A and, the other is labelled as Reason R. Assertion A: [6] Annulene, [8] Annulene and cis...
The correct decreasing order of priority of functional groups in naming an organic Question: compound as per IUPAC system of nomenclature is
Which technique among the following, is most appropriate in separation of a mixture of $$100 \,\mathrm{mg}$$ of $$p$$-nitrophenol and picric acid ?...
Which of the following compounds is not aromatic?
Arrange the following in decreasing acidic strength. ...
Which of the following carbocations is most stable?
The correct IUPAC name of the following compound is : ...
Which one of the following techniques is not used to spot components of a mixture separated on thin layer chromatographic plate?
Which of the following structure are aromatic in nature? ...
Which of the following is most stable?
The correct order of nucleophilicity is
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : A mixture contains benzoic acid a...
Phenol on reaction with dilute nitric acid, gives two products. Which method will be most efficient for large scale separation?
In the following structures, which on is having staggered conformation with maximum dihedral angle?
The IUPAC name of ethylidene chloride is :
Arrange the following carbocations in decreasing order of stability. ...
Which of the following is an example of conjugated diketone?
Arrange the following conformational isomers of n-butane in order of their increasing potential energy :...
Choose the correct name for compound given below :...
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R) :Assertion (A) : A simple distillation can b...
The compound/s which will show significant intermolecular H-bonding is/are :...
Which one of the following compounds is not aromatic?
The number of stereoisomers possible for 1, 2-dimethyl cyclopropane is :
Given below are two statements :Statement I : Hyperconjugation is a permanent effect.Statement II : Hyperconjugation in ethyl cation $$\left( {C{H_3} ...
Staggered and eclipsed conformers of ethane are :
The correct order of stability of given carbocation is :...
The correct decreasing order of densities of the following compounds is :...
Which among the following is the strongest acid ?
Which one among the following resonating structures is not correct?
Which purification technique is used for high boiling organic liquid compound (decomposes near its boiling point)?
Which of the following compounds does not exhibit resonance?
Which of the following molecules does not show stereo isomerism?
Which one of the following pairs of isomers is an example of metamerism?
Among the given species the Resonance stabilised carbocations are :...
In the following molecule,Hybridisation of Carbon a, b, and c respectively are :...
Compound with molecular formula C3H6O can show :
Nitrogen can be estimated by Kjeldahl's method for which of the following compound?
Which of the following is an aromatic compound?
Given below are two statements :Statement I : Retardation factor (Rf) can be measured in meter/centimeter.Statement II : Rf value of a compound remain...
In chromotography technique, the purification of compound is independent of :
Among the following, the aromatic compounds are :Choose the correct answer from the following options :...
Given below are two statements :Statement I : A mixture of chloroform and aniline can be separated by simple distillation.Statement II : When separati...
The correct order of acid character of the following compounds is :...
Which one of the following compounds is non-aromatic?
The IUPAC name of the following compound is : ...
Which of the following compounds shows geometrical isomerism?
The increasing order of boiling points of the following compounds is : ...
The IUPAC name of the following compound is : ...
Which one of the following compounds possesses the most acidic hydrogen?
Glycerol is separated in soap industries by :
The IUPAC name for the following compound is ...
Which of the following has the shortest C-Cl bond?
The increasing order of basicity for the following intermediates is (from weak to strong) ...
Kjeldahl's method cannot be used to estimate nitrogen for which of the following compounds?
A flask contains a mixture of isohexane and 3-methylpentane. One of the liquids boils at 63oC while the other boils at 60oC What is the best way to se...
A chromatography column, packed with silica gel as stationary phase, was used to separate a mixture of compounds consisting of (A) benzanilide (B) ani...
The increasing order to Pkb for the following compounds will be : ...
The IUPAC name for the following compound is : ...
The increasing order of the pKb of the following compound is : ...
In chromatography, which of the following statements is incorrect for Rf ?
Which of these factors does not govern the stability of a conformation in acyclic compounds?
The increasing order of nucleophilicity of the following nucleophiles is : (a) CH3CO2$$-$$           ...
The principle of column chromatography is :
The increasing order of the reactivity of the following compounds towards electrophilic aromatic substitution reactions is : ...
The correct IUPAC name of the following compound is : ...
The increasing order of reactivity of the following compounds towards aromatic electrophilic substitution reaction is : ...
Which of the following compounds will show the maximum 'enol' content?
In the following compounds, the decreasing order of basic strength will be :
The IUPAC name of the following compound is : ...
Among the following four aromatic compounds, which one will have the lowest melting point ?
In the following compound, the favourable site/s for protonation is/are : ...
The correct match between items I and II is : .tg {border-collapse:collapse;border-spacing:0;width:100%} .tg td{font-family:Arial, sans-serif;font-...
What is the IUPAC name of the following compound ? ...
If dichloromethane (DCM) and water (H2O) are used for differential extraction, which one of the following statements is correct ?
Which of the following compounds is not aromatic ?
The increasing basicity order of the following compounds is : ...
Which amongst the following is the strongest acid ?
The correct decreasing order for acid strength is :
Two compounds I and II are eluted by column chromatography (adsorption of I > II). Which one of following is a correct statement ?
On treatment of the following compound with a strong acid, the most susceptible site for bond cleavage is : ...
The IUPAC name of the following compound is : ...
The correct match between items of List-I and List-II is : .tg {border-collapse:collapse;border-spacing:0;} .tg td{font-family:Arial, sans-serif;fon...
Which of the following compounds is most reactive to an aqueous solution of sodium carbonate ?
In the following structure, the double bonds are marked as I, II, III and IV Geometrical isomerism is not possible at site (s) : ...
Which of the following statements is not true about partition chromatography?
A mixture containing the following four compounds is extracted with $$1M$$ $$HCl.$$ The compound that goes to aqueous layer is : ...
The IUPAC name of the following compound is : ...
Which of the following molecules is least resonance stabilized?
The hydrocarbon with seven carbon atoms containing a neopentyl and a vinyl group is :
The distillation technique most suited for separating glycerol from spent-lye in the soap industry is :
The absolute configuration of is : ...
In Carius method of estimation of halogens, 250 mg of an organic compound gave 141 mg of AgBr. The percentage of bromine in the compound is: (at. Mass...
Which of the following compounds will exhibit geometrical isomerism?
For the estimation of nitrogen, 1.4 g of organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in 60 mL of M/10 sulphu...
The order of stability of the following carbocations : ...
Identify the compound that exhibits tautomerism.
Out of the following, the alkene that exhibits optical isomerism is
The correct order of increasing basicity of the given conjugate bases (R = CH3) is
Arrange the carbanions, $${(C{H_3})_3}\overline C $$, $$\overline C C{l_3}$$ , $${(C{H_3})_2}\overline C H$$, $${C_6}{H_5}\overline C H{}_2$$ in orde...
The IUPAC name of neopentane is
The alkene that exhibits geometrical isomerism is :
The number of stereoisomers possible for a compound of the molecular formula CH3 - CH = CH - CH(OH) - Me is :
The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature is
The electrophile, $${E^ \oplus }$$ attacks the benzene ring to generate the intermediate $$\sigma - $$complex. Of the following, which $$\sigma - $$...
The absolute configuration of ...
Presence of a nitro group in a benzene ring
Which one of the following conformation of cyclohexane is chiral?
Which of the following molecules is expected to rotate the plane of plane - polarized light?
The increasing order of stability of the following free radicals is
Increasing order of stability among the three main conformations (i.e. Eclipse, Anti, Gauche) of 2-fluoroethanol is
CH3Br + Nu- $$\to$$ CH3 - Nu + Br- The decreasing order of the rate of the above reaction with nucleophiles (Nu–) A to D is [Nu– = (A) PhO–, (B) AcO–,...
The $$IUPAC$$ name of the compound shown below is : ...
Due to the presence of an unpaired electron, free radicals are:
The decreasing order of nucleophilicity among the nucleophiles ...
The reaction is fastest when $$X$$ is ...
Consider the acidity of the carboxylic acids: (a) PhCOOH (b) o – NO2C6H4COOH (c) p – NO2C6H4COOH (d) m – NO2C6H4COOH Which of the following order ...
Which of the following will have meso-isomer also?
Which one the following does not have sp2 hybridized carbon?
Which of the following compound is not chiral?
Which of the following is the strongest base ?
Amongst the following compounds, the optically active alkane having lowest molecular mass is
Rate of the reaction is fastest when $$Z$$ is ...
The $$IUPAC$$ name of the compound is ...
The IUPAC name of CH3COCH(CH3)2 is
In the anion HCOO$$-$$ the two carbon-oxygen bonds are found to be of equal length. What is the reason for it?
The general formula CnH2nO2 could be for open chain
Among the following four structures $$i$$ to $$iv,$$ it is true that ...
Which of the following does not show geometrical isomerism?
A similarity between optical and geometrical isomerism is that
Arrangement of (CH3)3C-, (CH3)2CH-, CH3-CH2- when attached to benzyl or an unsaturated group in increasing order of inductive effect is...
Racemic mixture is formed by mixing two
Which of the following compounds has wrong $$IUPAC$$ name ?
Following types of compounds (as $$I, II$$ ) are studied in terms of isomerism in : ...

Numerical

Three organic compounds A, B and $$\mathrm{C}$$ were allowed to run in thin layer chromatography using hexane and gave the following result (see figur...
The total number of chiral compound/s from the following is ______________. ...
Following chromatogram was developed by adsorption of compound 'A' on a 6 cm TLC glass plate. Retardation factor of the compound 'A' is _________ $$\t...
Optical activity of an enantiomeric mixture is $$+12.6^{\circ}$$ and the specific rotation of $$(+)$$ isomer is $$+30^{\circ}$$. The optical purity is...
Total number of isomers (including stereoisomers) obtained on monochlorination of methylcyclohexane is ___________.
The separation of two coloured substances was done by paper chromatography. The distances travelled by solvent front, substance A and substance B from...
The total number of monobromo derivatives formed by the alkanes with molecular formula C5H12 is (excluding stereo isomers) __________....
Observe structures of the following compounds The total number of structures/compounds which possess asymmetric carbon atoms is ______________....
Total number of possible stereoisomers of dimethyl cyclopentane is ____________.
Number of electrophilic centres in the given compound is _______________. ...
The dihedral angle in staggered form of Newman projection of 1, 1, 1-Trichloro ethane is ___________ degree. (Round off to the nearest integer)
The number of acyclic structural isomers (including geometrical isomers) for pentene are ___________
When 0.15 g of an organic compound was analyzed using Carius method for estimation of bromine, 0.2397 g of AgBr was obtained. The percentage of bromin...
Using the provided information in the following paper chromatogram :Fig : Paper chromatography for compounds A and B.the calculated Rf value of A ____...
The number of chiral carbons present in the molecule given below is _____ . ...

MCQ (More than One Correct Answer)

Which of the following is not an example of benzenoid compound?
Which one of the following compounds is aromatic in nature?
Among the following compounds, geometrical isomerism is exhibited by :
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