MHT CET · Chemistry · Haloalkanes and Haloarenes

What product is obtained when alkyl halides react with metallic sodium in presence of dry ether?

A Alkenes with same number of carbon atoms as in alkyl halide.
B Alkynes with same number of carbon atoms as in alkyl halide.
C Alkanes with same number of carbon atoms as in alkyl halide.
D Alkanes with double the number of carbon atoms as in alkyl halide.

Verified Solution

Answer & Solution

Correct Answer

(D) Alkanes with double the number of carbon atoms as in alkyl halide.

Step-by-step Solution

Detailed explanation

Wurtz reaction:
This involves coupling of two identical molecules of alkyl halide upon treatment with \(\mathrm{Na}\) metal in presence of dry ether to give alkanes with double the number of carbon atoms as in alkyl halide as follows:
\(\mathrm{R}-\mathrm{X} \stackrel{\mathrm{Na} / \text { dry ether }}{\longrightarrow} \mathrm{R}-\mathrm{R}+\mathrm{NaX}\)

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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