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Out of the following… (Class 12 Chemistry 2024, Q3)

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ChemistryCBSE Class 12 · Board exam 2024, set 56/5/1 · 1 mark · MCQ

CBSE Class 12 Chemistry 2024: question 3

Set in the CBSE Class 12 board exam of 2024, paper 56/5/1, section A, question 3, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q3 · 1 mark · MCQAlcohols, Phenols and Ethers

Out of the following alkenes, the one which will produce tertiary butyl alcohol on acid catalysed hydration is

  1. (A)
  2. (B)
  3. (C)
  4. (D)

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 56/5/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

Tertiary butyl alcohol has an OH on a carbon that carries three methyl groups.

Hint 2

Find the alkene that gives a tertiary carbocation when protonated.

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. , a tertiary carbocation (Markovnikov addition).

  2. Water then attacks this carbocation and loses to give , tert-butyl alcohol. Option (D).

    1 mark

Answer: , option (D)

Where the marks are

  • Chooses 2-methylpropene (isobutylene) as the alkene (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Alcohols, Phenols and Ethers, one at a time, marked against the answer key and marking points.Back to the full paper2024 board paper, set 56/5/1: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.