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Chemistry
Basics of Organic Chemistry
Previous Years Questions

Resonance in carbonate ion $$\left(\mathrm{CO}_{3}{ }^{2-}\right)$$ is Which of the following is true?...
The most stable carbocation for the following is: ...
The correct order of $\mathrm{pK}_{\mathrm{a}}$ values for the following compounds is: ...
The increasing order of $$\mathrm{pK_a}$$ for the following phenols is (A) 2, 4 - Dinitrophenol (B) 4 - Nitrophenol (C) 2, 4, 5 - Trimethylphenol (D) ...
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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? ...
Increasing order of stability of the resonance structures is : Choose the correct answer from the options given below :...
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 ...
Which among the following is the strongest Bronsted base?
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?
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 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 of the following structure are aromatic in nature? ...
Which of the following is most stable?
The correct order of nucleophilicity is
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 :...
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} ... 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 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? The correct order of their reactivity towards hydrolysis at room temperature is :... Among the given species the Resonance stabilised carbocations are :... In the following molecule,Hybridisation of Carbon a, b, and c respectively are :... Given below are two statements :Statement I : C2H5OH and AgCN both can generate nucleophile.Statement II : KCN and AgCN both will generate nitrile nuc... Compound with molecular formula C3H6O can show : Which of the following is an aromatic compound? Match List - I with List - II : List - I Test/Reagents/Observation(s) List - II Species detected (a) Lassaigne's... Which of the following is least basic? Among the following, the aromatic compounds are :Choose the correct answer from the following options :... Which of the following is 'a' FALSE statement ? The correct order of acid character of the following compounds is :... The correct order of the following compounds showing increasing tendency towards nucleophilic substitution reaction is : ... Which one of the following compounds is non-aromatic? The IUPAC name of the following compound is : ... The increasing order of pKb values of the following compounds is : ... Which of the following compounds shows geometrical isomerism? The increasing order of boiling points of the following compounds is : ... The increasing order of basicity of the following compounds is : ... Among the following compounds, which one has the shortest C – Cl bond? The decreasing order of reactivity of the following organic molecules towards AgNO3 solution is : ... The IUPAC name of the following compound is : ... The decreasing order of reactivity of the following compounds towards nucleophilic substitution (SN2) is : ... Which one of the following compounds possesses the most acidic hydrogen? The mechanism of SN1 reaction is given as : A student writes general characteristics based on the given mechanism as : (a) The reaction is favoured b... Consider the reaction sequence given below: Which of the following statements is true?... Which of the following compunds will show retention in configuration on nucleophilic substitution by OH– ion? The IUPAC name for the following compound is ... Which of the following has the shortest C-Cl bond? The decreasing order of basicity of the following amines is : ... The reaction of H3N3B3Cl3 (A) with LiBH4 in tetrahydrofuran gives inorganic benzene (B). Further, the reaction of (A) with (C) leads to H3N3B3(Me)3. C... The increasing order of basicity for the following intermediates is (from weak to strong) ... The decreasing order of reactivity towards dehydrohalogenation (E1) reaction of the following compounds is : ... The correct order of stability for the following alkoxides is : ... The increasing order to Pkb for the following compounds will be : ... The IUPAC name for the following compound is : ... Which one of the following is likely to give a precipitate with AgNO3 solution ? An organic compound 'A' is oxidizod with Na2O2 followed by boiling with HNO3. The resultant solution is then treated with ammonium molybdate to yield ... The increasing order of the pKb of the following compound is : ... 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$$-$$... Increasing rate of SN1 reaction in the following compounds is : ... The increasing order of the reactivity of the following compounds towards electrophilic aromatic substitution reactions is : ... Increasing order of reactivity of the following compounds for SN1 substitution is: ... Which of the following potential energy (PE) diagrams represents the SN1 reaction? 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 : ... The increasing order of the reactivity of the following with LiAlH4 is ... Among the following four aromatic compounds, which one will have the lowest melting point ? The increasing order of reactivity of the following compounds towards reaction with alkyl halides directly is (A) (B) (C) (D) ... In the following compound, the favourable site/s for protonation is/are : ... A 10 mg effervescent tablet containing sodium bicarbonate and oxalic acid releases 0.25 ml of CO2 at T = 298.15 K and p = 1 bar. If molar volume of CO... What is the IUPAC name of the following compound ? ... The increasing order of the pKa values of the following compounds is : ... The decreasing order of ease of alkaline hydrolysis for the following esters in ... 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 : Arrange the following amines in the decreasing order of basicity : ... Which of the following compounds will be suitable for Kjeldahl’s method for nitrogen estimation? 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 : ... 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) : ... The increasing order of the boiling points for the following compounds is : ... A mixture containing the following four compounds is extracted with$$1MHCl.$$The compound that goes to aqueous layer is : ... Which of the following statements is not true about partition chromatography ? The IUPAC name of the following compound is : ... Which of the following molecules is least resonance stabilized? 3-Methyl-pent-2-ene on reaction with HBr in presence of peroxide forms an addition product. The number of possible stereoisomers for the product is : The hydrocarbon with seven carbon atoms containing a neopentyl and a vinyl group is : The distillation technique most suited for separating glycerol from spent-lye in the soap industry is : The absolute configuration of is : ... In Carius method of estimation of halogens, 250 mg of an organic compound gave 141 mg of AgBr. The percentage of bromine in the compound is: (at. Mass... Which of the following compounds will exhibit geometrical isomerism? For the estimation of nitrogen, 1.4 g of organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in 60 mL of M/10 sulphu... A solution of (–$$l$$) – chloro –1 – phenylethane in toluene racemises slowly in the presence of a small amount of SbCl5, due to the formation of :... The order of stability of the following carbocations : ... Identify the compound that exhibits tautomerism. Out of the following, the alkene that exhibits optical isomerism is The correct order of increasing basicity of the given conjugate bases (R = CH3) is 29.5 mg of an organic compound containing nitrogen was digested according to Kjeldahl’s method and the evolved ammonia was absorbed in 20 mL of 0.1 M ... Arrange the carbanions,$${(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 - $$... The absolute configuration of ... Presence of a nitro group in a benzene ring Which one of the following conformation of cyclohexane is chiral? Which of the following molecules is expected to rotate the plane of plane - polarized light? CH3Br + Nu-$$\to$$CH3 - Nu + Br- The decreasing order of the rate of the above reaction with nucleophiles (Nu–) A to D is [Nu– = (A) PhO–, (B) AcO–,... The increasing order of stability of the following free radicals is Increasing order of stability among the three main conformations (i.e. Eclipse, Anti, Gauche) of 2-fluoroethanol is The$$IUPAC$$name of the compound shown below is : ... The alkene formed as a major product in the above elimination reaction is ... Due to the presence of an unpaired electron, free radicals are: The decreasing order of nucleophilicity among the nucleophiles ... The reaction is fastest when$$X$$is ... Which one of the following has the minimum boiling point? Which one the following does not have sp2 hybridized carbon? Which of the following compound is not chiral? Consider the acidity of the carboxylic acids: (a) PhCOOH (b) o – NO2C6H4COOH (c) p – NO2C6H4COOH (d) m – NO2C6H4COOH Which of the following order ... Which of the following will have meso-isomer also? Which of the following is the strongest base ? Amongst the following compounds, the optically active alkane having lowest molecular mass is Rate of the reaction is fastest when$$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,$$it is true that ... A similarity between optical and geometrical isomerism is that Which of the following does not show geometrical isomerism? Arrangement of (CH3)3C-, (CH3)2CH-, CH3-CH2- when attached to benzyl or an unsaturated group in increasing order of inductive effect is... The reaction :$${(CH)_3}C - Br\buildrel {{H_2}O} \over \longrightarrow {(CH)_3}C - OH$$Racemic mixture is formed by mixing two Which of the following compounds has wrong$$IUPAC$$name ? Following types of compounds (as$$I, II$$) are studied in terms of isomerism in : ... Numerical The total number of chiral compound/s from the following is ______________. ... Optical activity of an enantiomeric mixture is$$+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 total number of monobromo derivatives formed by he alkanes with molecular formula C5H12 is (excluding stereo isomers) __________....
The number of sp3 hybridised carbons in an acyclic neutral compound with molecular formula C4H5N is ___________....
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 ___________
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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