MHT CET · Chemistry · Alcohols Phenols and Ethers

Choose the false statement from following.

A Good yield of alkyl halide may be obtained by heating alcohols with \(\mathrm{NaI}\) in \(95 \% \mathrm{H}_3 \mathrm{PO}_4\).
B Constant boiling \(\mathrm{HBr}(48 \%)\) is used for the preparation of alkyl bromides from alcohols.
C Tertiary alcohol readily react with conc. \(\mathrm{HCl}\) in absence of zinc chloride.
D The order of reactivity of alcohols with a given halo acid \(1^{\circ}>2^{\circ}>3\).

Verified Solution

Answer & Solution

Correct Answer

(D) The order of reactivity of alcohols with a given halo acid \(1^{\circ}>2^{\circ}>3\).

Step-by-step Solution

Detailed explanation

The correct order of reactivity of alcohols with a given halo acid is \(3^{\circ}>2^{\circ}>1^{\circ}\). Thus, statement \(\mathrm{D}\) is false.

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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