Question 54

The major product of the following reaction is $$P$$. $$CH_3C \equiv C-CH_3 \xrightarrow[\text{(ii) dil. KMnO}_4, 273\text{ K}]{\text{(i) Na/liq. NH}_3} P$$. Number of oxygen atoms present in product '$$P$$' is _______ (nearest integer)

Correct Answer: 2

CH₃C≡C-CH₃ with Na/liq. NH₃ gives trans-2-butene (Birch reduction gives trans alkene).

Then dil. KMnO₄ at 273 K (cold) gives a diol: trans-but-2-ene-2,3-diol (syn addition giving glycol).

The product has 2 oxygen atoms (two OH groups).

The answer is 2.

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The major product of the following reaction is $$P$$. $$CH_3C \equiv C-CH_3 \xrightarrow[\text{(ii) dil. KMnO}_4, 273\text{ K}]{\text{(i) Na/liq. NH}_3} P$$. Number of oxygen atoms present in product &#x27;$$P$$&#x27; is _______ (nearest integer)