JEE Main
Chemistry
Hydrocarbons
Previous Years Questions

## MCQ (Single Correct Answer)

'$$\mathrm{X}$$' is : ...
But-2-yne is reacted separately with one mole of Hydrogen as shown below : A. A is more soluble than B. B. The boiling point & melting point of A...
Decreasing order of dehydration of the following alcohols is ...
A hydrocarbon ' $\mathrm{X}$ ' with formula $\mathrm{C}_{6} \mathrm{H}_{8}$ uses two moles of $\mathrm{H}_{2}$ on catalytic hydrogenation of its one m...
Choose the correct set of reagents for the following conversion. trans $$\left(\mathrm{Ph}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}_{3}\right) \rightarrow ... Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: can be easily reduced using \math... The major products 'A' and 'B', respectively, are ... The one giving maximum number of isomeric alkenes on dehydrohalogenation reaction is (excluding rearrangement) The isomeric deuterated bromide with molecular formula$$\mathrm{C_4H_8DBr}$$having two chiral carbon atoms is The correct sequence of reagents for the preparation of Q and R is :... The compound which will have the lowest rate towards nucleophilic aromatic substitution on treatment with OH$$^-$$is Find out the major products from the following reactions. ... In the following given reaction, 'A' is ... Which among the following pairs of the structures will give different products on ozonolysis? (Consider the double bonds in the structures are rigid a... Arrange the following in increasing order of reactivity towards nitration A. p-xylene B. bromobenzene C. mesitylene D. nitrobenzene E. benzene Choose ... Choose the correct option for the following reactions. ... Major product '$$\mathrm{B}$$' of the following reaction sequence is : ...$$ \stackrel{\bullet}{\mathrm{Cl}}+\mathrm{CH}_{4} \rightarrow \mathrm{A}+\mathrm{B} $$A and B in the above atmospheric reaction step are :... A compound ‘$$\mathrm{A}$$’ on reaction with ‘$$\mathrm{X}$$’ and ‘$$\mathrm{Y}$$’ produces the same major product but different by product '$$a$$' an... In Friedel-Crafts alkylation of aniline, one gets Two isomers 'A' and 'B' with molecular formula C4H8 give different products on oxidation with KMnO4 in acidic medium. Isomer 'A' on reaction with KMnO... What will be the major product of following sequence of reactions? ... Product 'A' of following sequence of reactions is ... 'A' and 'B' respectively are: ... The major product in the following reaction ... Halogenation of which one of the following will yield m-substituted product with respect to methyl group as a major product? The product formed in the following reaction. ... Given below are two statements : Statement I : The presence of weaker$$\pi$$-bonds make alkenes less stable than alkanes. Statement II : The strength... Which of the following reagents / reactions will convert 'A' to 'B' ? ... The stereoisomers that are formed by electrophilic addition of bromine to trans-but-2-ene is/are : In the following sequence of reactions,The compounds B and C respectively are :-... For the following sequence of reactions, the correct products are :... Identify correct A, B and C in the reaction sequence given below :... The major product (A) formed in the reaction given below is :... Consider the given reaction, the product A is :... The major product formed in the following reaction is :... Among the following compounds I-IV, which one forms a yellow precipitate on reacting sequentially with (i) NaOH (ii) dil. HNO3 (iii) AgNO3?... Excess of isobutane on reaction with Br2 in presence of light at 125$$^\circ$$C gives which one of the following, as the major product? Consider the above reaction, and choose the correct statement :... The correct sequence of correct reagents for the following transformation is :... Presence of which reagent will affect the reversibility of the following reaction, and change it to a irreversible reaction :CH4 + I2$$\mathrel{\math...
An organic compound 'A' C4H8 on treatment with KMnO4/H+ yields compound 'B' C3H6O.Compound 'A' also yields compound 'B' an ozonolysis. Compound 'A' is...
In the chemical reactions given above A and B respectively are :...
Benzene on nitration gives nitrobenzene in presence of HNO3 and H2SO4 mixture, where :
Major product P of above reaction, is :...
In the given reaction 3-Bromo-2, 2-dimethyl butane $$\buildrel {{C_2}{H_5}OH} \over \longrightarrow \mathop {'A'}\limits_{(Major\,\Pr oduct)}$$ Pro...
For above chemical reactions, identify the correct statement from the following :...
Main products formed during a reaction of 1-methoxy naphthalene with hydroiodic acid are :
Match List - I with List - II :List - I (Chemicals)(a) Alcoholic potassium hydroxide(b) Pd/BaSO4(c) BHC (Benzene hexachloride)(d) PolyacetyleneList - ...
Choose the correct statement regarding the formation of carbocations A and B given....
Given below are two statements :Statement I : 2-methylbutane on oxidation with KMnO4 gives 2-methylbutan-2-ol.Statement II : n-alkanes can be easily o...
Product ''A'' in the above chemical reaction is :...
An unsaturated hydrocarbon X on ozonolysis gives A. Compound A when warmed with ammonical silver nitrate forms a bright silver mirror along the sides ...
The products ''A'' and ''B'' formed in above reactions are :...
In $$\mathop C\limits^1 {H_2} = \mathop C\limits^2 = \mathop C\limits^3 H - \mathop C\limits^4 {H_3}$$ molecule, the hybridization of carbon 1, 2, 3 ...
The correct sequence of reagents used in the preparation of 4-bromo-2-nitroethyl benzene from benzene is :
The major product of the following reaction is :...
Identify A in the given chemical reaction. ...
Identify A and B in the chemical reaction....
Which of the following compound gives pink colour on reaction with phthalic anhydride in conc. H2SO4 followed by treatment with NaOH ?...
What is the major product formed by HI on reaction with ...
Identify products A and B. ...
Match the following : .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Ari...
The increasing order of the boiling points of the major products A, B and C of the following reactions will be : ...
The major product of the following reaction is : ...
The major product obtained from the following reaction is : ...
The major product formed in the following reaction is : CH3CH = CHCH(CH3)2 $$\buildrel {HBr} \over \longrightarrow$$...
Which of the following compounds produces an optically inactive compound on hydrogenation?
The major product in the following reaction is : ...
In the following reaction A is : ...
Which of the following reactions will not produce a racemic product?
Identify (A) in the following reaction sequence : ...
The correct order of heat of combustion for following alkadienes is : ...
The major product (Y) in the following reactions is : ...
An unsaturated hydrocarbon X absorbs two hydrogen molecules on catalytic hydrogenation and also gives following reaction : B(3 - oxo - hexanedicarbox...
The major product [B] in the following sequence of reactions is :- ...
The major product in the following reaction is: ...
The major products A and B in the following reactions are : ...
Consider the following reactions : Which of these reactions are possible ?...
In the following reactions sequence, structure of A and B respectively will be : ...
In the following skew conformation of ethane, H'–C–C–H'' dihedral angle is : ...
Consider the following reactions : 'A' is :...
But-2-ene on reaction with alkaline KMnO4 at elevated temperature followed by acidification will give :
The major product of the following addition reaction is : H3C–CH=CH2 $$\buildrel {C{l_2}/{H_2}O} \over \longrightarrow$$
The major product obtained in the given reaction is : ...
The major product of the following reaction is : ...
The major product of the following reaction is : ...
Which one of the following alkenes when treated with HCl yields majorly an anti Markovnikov product?
Polysubstitution is a major drawback in:
The major product of the following reaction is – ...
The correct order for acid strength of compounds : CH $$\equiv$$ CH, CH3–C $$\equiv$$ CH and CH2 = CH2 is as follows ...
The major product of the following reaction is ...
Which of the following compounds will produce a precipitate with AgNO3 ?
Which compound (s) out of the following is/are not aromatic ? ...
The major product of the following reaction is : ...
Which hydrogen in compound (E) is easily replaceable during bromination reaction in presence of light ? ...
The major product of the following reaction is : ...
The major product of the following reaction is : ...
The trans-alkenes are formed by the reduction of alkynes with
Biochemical Oxygen Demand (BOD) value can be a measure of water pollution caused by the organic matter. Which of the following statements is correct ?...
When 2-butyne is treate with H2/Lindlar's catalyst, compound X is produced as the major product and when treated with Na/liq. NH3 it produces Y as th...
The major product of the following reaction is : ...
At 300 K and 1 atm, 15 mL of a gaseous hydrocarbon requires 375 mL air containing 20% O2 by volume for complete combustion. After combustion the gases...
The reaction of propene with HOCl (Cl2 + H2O) proceeds through the intermediate:
Which compound would give $$5$$ - keto - $$2$$ - methylhexanal upon ozonolysis?
Which branched chain isomer of the hydrocarbon with molecular mass 72u gives only one isomer of mono substituted alkyl halide ?
2–Hexyne gives trans–2–Hexene on treatment with :
Ozonolysis of an organic compound gives formaldehyde as one of the products. This confirms the presence of :
One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of 44 u. The alkene is
The hydrocarbon which can react with sodium in liquid ammonia is
Toluene is nitrated and the resulting product is reduced with tin and hydrochloric acid. The product so obtained is diazotised and then heated with cu...
In the following sequence of reactions, the alkene affords the compound ‘B’ CH3 - CH = CH - CH3 $$\buildrel {{O_3}} \over \longrightarrow$$ A $$\ma... The treatment of$$C{H_3}MgX\,\,$$with$$C{H_3}C \equiv C - H$$produces The compound formed as a result of oxidation of ethyl benzene by KMnO4 is Which of the following reactions will yield 2, 2-dibromopropane? The reaction of toluene with Cl2 in presence of FeCl3 gives predominantly Reaction of one molecule of HBr with one molecule of 1,3-butadiene at 40oC gives predominantly Of the five isomeric hexanes, the isomer which can give two monochlorinated compounds is 2 methylbutane on reacting with bromine in the presence of sunlight gives mainly Acid catalyzed hydration of alkenes except ethene leads to the formation of Which types of isomerism is shown by 2,3-dichlorobutane? On mixing a certain alkane with chlorine and irradiating it with ultravioletlight, it forms only one monochloroalkane. This alkane could be Butene-1 may be converted to butane by reaction with Which of these will not react with acetylene ? What is the product when acetylene reacts with hypochlorous acid ? ## Numerical 17 mg of a hydrocarbon (M.F.$$\mathrm{C_{10}H_{16}}$$) takes up 8.40 mL of the H$$_2$$gas measured at 0$$^\circ$$C and 760 mm of Hg. Ozonolysis of t... Maximum number of isomeric monochloro derivatives which can be obtained from 2,2,5,5-tetramethylhexane by chlorination is _____________ In bromination of Propyne, with Bromine, 1, 1, 2, 2-tetrabromopropane is obtained in 27% yield. The amount of 1, 1, 2, 2-tetrabromopropane obtained fr... In the following reaction The$$\%$$yield for reaction I is$$60 \%$$and that of reaction II is$$50 \%$$. The overall yield of the complete reacti... In the presence of sunlight, benzene reacts with Cl2 to give product, X. The number of hydrogens in X is _____________. In the given reaction, The number of$$\pi electrons present in the product 'P' is _________....
The major product 'A' of the following given reaction has _____________ sp2 hybridized carbon atoms. ...
Consider the above chemical reaction. The total number of stereoisomers possible for Product 'P' is _____________....
The number of sigma bonds in is _______________....
Consider the following chemical reaction. The number of sp2 hybridized carbon atom(s) present in the product is ________....
Consider the following reactions The mass percentage of carbon in A is ______....
In the following sequence of reactions the maximum number of atoms present in molecule 'C' in one plane is _________. (A is a lowest molecular weight...
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