MHT CET · Chemistry · Alcohols Phenols and Ethers

Which of the following is a secondary allylic alcohol?

A \(\mathrm{CH}_2=\mathrm{CH}-\mathrm{CH}_2-\mathrm{OH}\)
C \(\mathrm{CH}_3-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}_2-\mathrm{OH}\)
D \(\mathrm{CH}_2=\mathrm{CH}-\mathrm{C}\left(\mathrm{CH}_3\right)_2-\mathrm{OH}\)

Verified Solution

Answer & Solution

Correct Answer

(B)

Step-by-step Solution

Detailed explanation

\(\mathrm{CH}_3-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}_2-\mathrm{CH}_2-X\)
- In this structure, the halogen is attached to a carbon that is not adjacent to a \(\mathrm{C}=\mathrm{C}\) double bond, because it is two carbons away from the double bond. This does not make it an allylic halide. This is NOT an allylic halide.
The correct answer is (2), which is not an allylic halide.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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