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Haloalkanes and Haloarenes · Question 26

JEE Main 2025 (Online) 28th January Evening ShiftMCQMedium📈 Topic in 13% papers+4−1
1

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

Answer

(3) 2-Phenylhepta-2,4-diene

Solution

The substrate is CH3-CH(C6H5)-CHBr-CH2-CHBr-CH2-CH3, i.e. 3,5-dibromo-2-phenylheptane (C-1 = the methyl on the benzylic carbon).

Excess alcoholic KOH with heat removes two molecules of HBr (two β-eliminations).

Elimination at C-3: the β-H on C-2 is benzylic and tertiary; removing it gives the more substituted double bond C2=C3 that is also conjugated with the benzene ring (Saytzeff product, extra resonance stability).

Elimination at C-5: a β-H can come from C-4 or C-6; removing it from C-4 gives C4=C5, which is conjugated with C2=C3 (conjugated diene is more stable).

Product: CH3-C(C6H5)=CH-CH=CH-CH2-CH3, a fully conjugated system (ring + C2=C3 + C4=C5).

IUPAC name: 2-Phenylhepta-2,4-diene.

Answer: (3)

JEE Main 2025 (Online) 28th January Evening Shift

Keep practising — Haloalkanes and Haloarenes

2

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

  1. Both Statement I and Statement II are true
  2. Both Statement I and Statement II are false
  3. Statement I is true but Statement II is false
  4. Statement I is false but Statement II is true
JEE Main 2026 (Online) 8th April Evening Shift
3

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

  1. Both Statement I and Statement II are true
  2. Both Statement I and Statement II are false
  3. Statement I is true but Statement II is false
  4. Statement I is false but Statement II is true
JEE Main 2026 (Online) 6th April Morning Shift
4

RMgI when treated with ice cold water liberated a gas which occupied 1.4 dm3/g at STP. The gas produced is further reacted with iodine in presence of HIO3 to give compound (X). Compound (X) in presence of Na and dry ether produced compound (Y). Molar mass of compound (Y) is g mol-1. (Nearest integer)

JEE Main 2026 (Online) 5th April Evening Shift
5

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

  1. A-I, B-IV, C-III, D-II
  2. A-III, B-I, C-IV, D-II
  3. A-IV, B-II, C-I, D-III
  4. A-I, B-III, C-II, D-IV
JEE Main 2026 (Online) 4th April Morning Shift
6

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

  1. Both Statement I and Statement II are true
  2. Both Statement I and Statement II are false
  3. Statement I is true but Statement II is false
  4. Statement I is false but Statement II is true
JEE Main 2026 (Online) 2nd April Morning Shift
7

Correct statements regarding alkyl halides (R–X) among the following are : Choose the correct answer from the options given below :

  1. A, B and C Only
  2. B and D Only
  3. A and E Only
  4. D and E Only
JEE Main 2026 (Online) 2nd April Evening Shift
8

Which of the following reactions is NOT correctly represented?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
JEE Main 2026 (Online) 28th January Evening Shift
9

Identify the correct statements : The presence of -NO2 group in benzene ring Choose the correct answer from the options given below :

  1. A and D Only
  2. B and D Only
  3. C and A Only
  4. B and C Only
JEE Main 2026 (Online) 28th January Evening Shift
10

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

  1. Statement I is false but Statement II is true
  2. Statement I is true but Statement II is false
  3. Both Statement I and Statement II are true
  4. Both Statement I and Statement II are false
JEE Main 2026 (Online) 24th January Morning Shift
11

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

  1. A-III, B-IV, C-I, D-II
  2. A-IV, B-I, C-III, D-II
  3. A-III, B-IV, C-II, D-I
  4. A-I, B-II, C-IV, D-III
JEE Main 2026 (Online) 24th January Morning 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