Ncert Exercises & Solutions

Given below are two statements:

Assertion (A):	tert-Butyl bromide undergoes Wurtz reaction to give 2,2,3,3-tetramethylbutane.
Reason (R):	In Wurtz reaction, primary alkyl halides react with sodium in dry ether to give hydrocarbon containing double the number of carbon atoms present in the halide.

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	(A) is False but (R) is True.

Explanation:
Assertion (A)
tert-Butyl bromide (tert-butyl halide) does not undergo the Wurtz reaction effectively because tertiary alkyl halides are prone to elimination reactions and side reactions. Therefore, tert-butyl bromide is unlikely to give 2,2,3,3-tetramethylbutane via the Wurtz reaction.
\(\left(\mathrm{CH}_3\right)_3 \mathrm{C}-\mathrm{Br}+2 \mathrm{Na} \xrightarrow[-\mathrm{NaBr}]{ }\left(\mathrm{CH}_3\right)_3-\stackrel{-+}{\mathrm{CNa}}\)

Hence, (A) is False.
Reason (R)
The reason correctly states that in the Wurtz reaction, primary alkyl halides react with sodium in dry ether to form hydrocarbons with double the number of carbon atoms present in the halide.
This statement is True.

So, the correct option is 4. (A) is False but (R) is True.

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