MHT CET · Chemistry · Hydrocarbons

The correct order of dehydration of alcohols is

A \(1^{\circ}>2^{\circ}>3^{\circ}\)
B \(3^{\circ}>2^{\circ}>1^{\circ}\)
C \(2^{\circ}>1^{\circ}>3^{\circ}\)
D \(1^{\circ}>3^{\circ}>2^{\circ}\)

Verified Solution

Answer & Solution

Correct Answer

(B) \(3^{\circ}>2^{\circ}>1^{\circ}\)

Step-by-step Solution

Detailed explanation

Dehydration of alcohols involve the formation of carbocation intermediates. More the stability of carbocation, more will be the ease of alcohol towards dehydration.
\(\because\) The order of stability of carbocations is
\(
3^{\circ}>2^{\circ}>1^{\circ}
\)
\(\therefore\) The order of ease of dehydration of alcohols is
\(
3^{\circ}>2^{\circ}>1^{\circ}
\)

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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