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Hydrocarbons

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Every question from past board papers on Hydrocarbons, newest paper first. Open any question for its full worked answer.

NEET UG 2025 question paper (official, booklet 45)

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  1. Which one of the following reactions does NOT give benzene as the product ?

    Four reactions: sodium benzoate + sodalime/heat; n-hexane Mo2O3 773K 10-20 atm; ethyne red hot iron tube 873 K; benzenediazonium chloride + H2O warm

    4 marks · See worked answer →

  2. How many products (including stereoisomers) are expected from monochlorination of the following compound?

    \((\mathrm{CH_3})_2\mathrm{CH-CH_2-CH_3}\)

    2-methylbutane drawn as (CH3)2CH-CH2-CH3

    4 marks · See worked answer →

  3. Which one of the following compounds does not decolourize bromine water?

    (1) cyclohexane ring; (2) phenol; (3) styrene; (4) aniline

    4 marks · See worked answer →

NEET UG 2024 question paper (official, booklet S6)

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  1. Given below are two statements:

    Statement I : The boiling point of three isomeric pentanes follows the order

    n-pentane > isopentane > neopentane

    Statement II : When branching increases, the molecule attains a shape of sphere. This results in smaller surface area for contact, due to which the intermolecular forces between the spherical molecules are weak, thereby lowering the boiling point.

    In the light of the above statements, choose the most appropriate answer from the options given below:

    4 marks · See worked answer →

  2. For the given reaction:

    [scheme: ring-C(H)=CH-ring \(\xrightarrow{KMnO_4/H^+}\) 'P' (major product), see figure]

    'P' is

    stilbene-type reaction with KMnO4/H+ and four product structures

    4 marks · See worked answer →

NEET UG 2023 question paper (official, booklet G6)

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  1. Weight (g) of two moles of the organic compound, which is obtained by heating sodium ethanoate with sodium hydroxide in presence of calcium oxide is :

    4 marks · See worked answer →

  2. Which amongst the following molecules on polymerization produces neoprene?

    four structural-formula options

    4 marks · See worked answer →

  3. Identify the final product [D] obtained in the following sequence of reactions.

    \(\mathrm{CH_3CHO \xrightarrow[ii)\ H_3O^+]{i)\ LiAlH_4} [A] \xrightarrow[\Delta]{H_2SO_4} [B] \xrightarrow{HBr} [C]}\), then [C] + bromobenzene \(\xrightarrow{Na/dry\ ether}\) [D]

    reaction sequence and options (some are structures)

    4 marks · See worked answer →

  4. Consider the following compounds/species :

    i. naphthalene ii. cyclopentadienyl anion iii. cyclobutadiene iv. cyclopropenyl anion v. cyclopropenyl cation vi. cyclooctatetraene vii. anthracene (all drawn as structures)

    The number of compounds/species which obey Huckel's rule is ________.

    seven structures i-vii

    4 marks · See worked answer →

NEET UG 2022 question paper (official, booklet R6)

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  1. Which compound amongst the following is not an aromatic compound ?

    four ring structures: cycloheptatriene-like ring (1), cyclopentadienyl anion (2), tropylium cation (3), cyclopropenyl cation (4)

    4 marks · See worked answer →

  2. Compound X on reaction with \(O_3\) followed by Zn/\(H_2O\) gives formaldehyde and 2-methyl propanal as products. The compound X is :

    4 marks · See worked answer →

NEET UG 2021 question paper (official, booklet M4)

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  1. The major product formed in dehydrohalogenation reaction of 2-Bromo pentane is Pent-2-ene. This product formation is based on ?

    4 marks · See worked answer →

  2. The major product of the following chemical reaction is :

    \((CH_3)_2CH-CH=CH_2 + HBr \xrightarrow{(C_6H_5CO)_2O_2} ?\)

    reaction of 3-methylbut-1-ene with HBr/peroxide and four structure options

    4 marks · See worked answer →

  3. Dihedral angle of least stable conformer of ethane is :

    4 marks · See worked answer →

  4. \(CH_3CH_2COO^-Na^+ \xrightarrow[\text{Heat}]{NaOH,\ +\ ?} CH_3CH_3 + Na_2CO_3\).

    Consider the above reaction and identify the missing reagent/chemical.

    4 marks · See worked answer →

NEET UG 2020 question paper (official, booklet E1)

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  1. An alkene on ozonolysis gives methanal as one of the product. Its structure is :

    four cyclohexane/cyclohexene structures with side chains

    4 marks · See worked answer →

  2. Which of the following alkane cannot be made in good yield by Wurtz reaction ?

    4 marks · See worked answer →

NEET UG 2019 question paper (official, booklet P1)

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  1. The most suitable reagent for the following conversion, is :

    \(H_3C-C\equiv C-CH_3 \to\) cis-2-butene

    but-2-yne to cis-2-butene conversion scheme

    4 marks · See worked answer →

  2. Among the following, the reaction that proceeds through an electrophilic substitution, is :

    four reaction schemes as options

    4 marks · See worked answer →

  3. An alkene "A" on reaction with O\(_3\) and Zn-H\(_2\)O gives propanone and ethanal in equimolar ratio. Addition of HCl to alkene "A" gives "B" as the major product. The structure of product "B" is :

    four structural formulas as options

    4 marks · See worked answer →

NEET UG 2018 question paper (official, booklet EE)

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  1. Nitration of aniline in strong acidic medium also gives m-nitroaniline because

    4 marks · See worked answer →

  2. Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. (A) is

    4 marks · See worked answer →

  3. The compound C\(_7\)H\(_8\) undergoes the following reactions :

    C\(_7\)H\(_8\) \(\xrightarrow{3\ Cl_2/\Delta}\) A \(\xrightarrow{Br_2/Fe}\) B \(\xrightarrow{Zn/HCl}\) C

    The product 'C' is

    reaction scheme C7H8 to A to B to C

    4 marks · See worked answer →

  4. Identify the major products P, Q and R in the following sequence of reactions :

    benzene + CH\(_3\)CH\(_2\)CH\(_2\)Cl \(\xrightarrow{\text{Anhydrous AlCl}_3}\) P ; P \(\xrightarrow[\text{(ii) H}_3\text{O}^+/\Delta]{\text{(i) O}_2}\) Q + R

    reaction scheme and structure options P, Q, R

    4 marks · See worked answer →

NEET UG 2017 question paper (official, booklet B)

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  1. With respect to the conformers of ethane, which of the following statements is true ?

    4 marks · See worked answer →

  2. Predict the correct intermediate and product in the following reaction :

    \(H_3C-C\equiv CH \xrightarrow[HgSO_4]{H_2O,\ H_2SO_4}\) intermediate (A) \(\rightarrow\) product (B)

    reaction scheme with four options of structures A and B

    4 marks · See worked answer →

  3. Which one is the correct order of acidity ?

    4 marks · See worked answer →

NEET UG 2016 Phase 1 question paper (official, booklet A)

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  1. In the reaction \(H-C\equiv CH \xrightarrow[(2)\ CH_3CH_2Br]{(1)\ NaNH_2/liq.NH_3} X \xrightarrow[(2)\ CH_3CH_2Br]{(1)\ NaNH_2/liq.NH_3} Y\), X and Y are :

    4 marks · See worked answer →

  2. Consider the nitration of benzene using mixed conc. \(H_2SO_4\) and \(HNO_3\). If a large amount of \(KHSO_4\) is added to the mixture, the rate of nitration will be :

    4 marks · See worked answer →

  3. The correct statement regarding the comparison of staggered and eclipsed conformations of ethane, is :

    4 marks · See worked answer →

NEET UG 2016 Phase 2 question paper (official, booklet ZZ)

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  1. Which of the following can be used as the halide component for Friedel-Crafts reaction?

    4 marks · See worked answer →

  2. In the given reaction [benzene + cyclohexene, HF, 0 C -> P] the product \(P\) is

    reaction scheme plus 4 product structure options

    4 marks · See worked answer →

  3. The compound that will react most readily with gaseous bromine has the formula

    4 marks · See worked answer →