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MCQEasyJEE 2023Alkenes (Electrophilic Addition, Polymerisation)

JEE Chemistry 2023 Question with Solution

Reaction scheme image showing 2-hexene undergoing ozonolysis with reagents ozone and water to give products.
  • A

    Butanoic acid and acetic acid

  • B

    Butanal and acetic acid

  • C

    Butanal and acetaldehyde

  • D

    Butanoic acid and acetaldehyde

Answer

Correct answer:A

Step-by-step solution

Standard Method

Given: The reaction involves ozonolysis of 22-hexene.

Find: The products formed after cleavage of the double bond.

In ozonolysis of 22-hexene, ozone cleaves the C=CC=C bond and forms two carbonyl-containing products. According to the provided solution, the products obtained are acetic acid and butanoic acid.

Thus, the correct products are Butanoic acid and acetic acid.

Therefore, the correct option is A.

Quick Identification

Given: Ozonolysis of 22-hexene is asked.

Find: Which pair of products matches the cleavage pattern.

Use the quick rule stated in the solution: ozonolysis cleaves the double bond into two smaller carbonyl compounds. The provided working identifies these directly as acetic acid and butanoic acid.

Therefore, the correct option is A.

Common mistakes

  • Assuming ozonolysis always gives aldehydes is incorrect because the products depend on the reaction conditions and the substrate. Here, the provided solution identifies acids, so the products should be matched accordingly.

  • Ignoring where the C=CC=C bond breaks is wrong because ozonolysis products are determined by splitting exactly at the double bond. Always identify the two fragments formed after cleavage before matching options.

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