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Haloalkanes and Haloarenes · Question 16

JEE Main 2025 (Online) 7th April Morning ShiftMCQMedium📈 Topic in 13% papers+4−1
1

The reactions which cannot be applied to prepare an alkene by elimination, are Choose the correct answer from the options given below:

  1. B & E Only
  2. B, C & D Only
  3. A, C & D Only
  4. B & D Only

Answer

(4) B & D Only

Solution

A: 1-Bromo-2-methylcyclohexane + NaOEt (strong base) dehydrohalogenation (β-elimination) gives 1-methylcyclohexene (Saytzeff product). Alkene formed.

B: 2-Bromobutane + KOH (aq): in aqueous medium OH- acts as a nucleophile substitution gives butan-2-ol, CH3CH2CH(OH)CH3. No alkene (alcoholic KOH would be needed).

C: tert-Butyl bromide + NaOMe (strong base): a 3° halide readily undergoes elimination 2-methylpropene, (CH3)2C=CH2. Alkene formed.

D: Phenol + Na2Cr2O7/H2SO4 oxidation to benzoquinone (as per NCERT). No elimination, no alkene.

E: tert-Butyl alcohol + Cu at 573 K: a 3° alcohol undergoes dehydration 2-methylpropene, (CH3)2C=CH2. Alkene formed.

Reactions B and D cannot give an alkene.

Answer: (4)

JEE Main 2025 (Online) 7th April Morning Shift

Keep practising — Haloalkanes and Haloarenes

2

Match List - I with List - II. Choose the correct answer from the options given below :

  1. A-II, B-III, C-I, D-IV
  2. A-III, B-IV, C-II, D-I
  3. A-IV, B-III, C-I, D-II
  4. A-IV, B-III, C-II, D-I
JEE Main 2025 (Online) 7th April Evening Shift
3

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

  1. Both Statement I and Statement II are incorrect
  2. Both Statement I and Statement II are correct
  3. Statement I is incorrect but Statement II is correct
  4. Statement I is correct but Statement II is incorrect
JEE Main 2025 (Online) 4th April Evening Shift
4

In the following series of reactions identify the major products A & B respectively : [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
JEE Main 2025 (Online) 3rd April Evening Shift
5

Match List-I with List-II. Choose the correct answer from the options given below:

  1. (A)-(III), (B)-(II), (C)-(IV), (D)-(I)
  2. (A)-(IV), (B)-(III), (C)-(I), (D)-(II)
  3. (A)-(IV), (B)-(I), (C)-(II), (D)-(III)
  4. (A)-(III), (B)-(IV), (C)-(II), (D)-(I)
JEE Main 2025 (Online) 2nd April Evening Shift
6

[figure] Consider the above sequence of reactions. 151 g of 2-bromopentane is made to react. Yield of major product P is 80\% whereas Q is 100\%. Mass of product Q obtained is g. (Given molar mass in g mol-1 H : 1, C : 12, O : 16, Br : 80)

JEE Main 2025 (Online) 2nd April Evening Shift
7

In the following substitution reaction : [figure] Product 'P' formed is :

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
JEE Main 2025 (Online) 29th January Morning Shift
8

The products A and B in the following reactions, respectively are A AgNO2 CH3-CH2-CH2-Br AgCN B

  1. CH3-CH2-CH2-ONO, CH3-CH2-CH2-CN
  2. CH3-CH2-CH2-NO2, CH3-CH2-CH2-CN
  3. CH3-CH2-CH2-ONO, CH3-CH2-CH2-NC
  4. CH3-CH2-CH2-NO2, CH3-CH2-CH2-NC
JEE Main 2025 (Online) 28th January Morning Shift
9

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

  1. Both Statement I and Statement II are correct
  2. Statement I is incorrect but Statement II is correct
  3. Both Statement I and Statement II are incorrect
  4. Statement I is correct but Statement II is incorrect
JEE Main 2025 (Online) 28th January Morning Shift
10

The product B formed in the following reaction sequence is: [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
JEE Main 2025 (Online) 28th January Evening Shift
11

The major product of the following reaction is: [figure]

  1. 6-Phenylhepta-3,5-diene
  2. 6-Phenylhepta-2,4-diene
  3. 2-Phenylhepta-2,4-diene
  4. 2-Phenylhepta-2,5-diene
JEE Main 2025 (Online) 28th January Evening Shift

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All JEE Main Chemistry chapters
Physical ChemistrySome Basic Concepts of ChemistryStructure of AtomStates of MatterThermodynamicsEquilibriumRedox ReactionsSolutionsElectrochemistryChemical Kinetics
Inorganic ChemistryClassification of Elements and Periodicity in PropertiesChemical Bonding and Molecular Structurep-Block Elements (Group 13 & 14)p-Block Elements (Group 15–18)d- and f-Block ElementsCoordination Compounds
Organic ChemistryOrganic Chemistry – Some Basic Principles and TechniquesIsomerismHydrocarbonsHaloalkanes and HaloarenesAlcohols, Phenols and EthersAldehydes, Ketones and Carboxylic AcidsAminesBiomoleculesPrinciples Related to Practical Chemistry