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Which of the following on addition of water in presence of acid gives a ketone

Which of the following on addition of water in presence of acid gives a ketone

Options

(a) Propene
(b) Butene-2
(c) Propyne
(d) None of these

Correct Answer:

Propyne

Explanation:

Alkynes on hydration in presence of dilute H₂SO₄ and HgSO₄ as catalyst produces aldehydes and ketones. Water adds to form unstable enol intermediates which undergo rearrangment to form aldehyde or ketones. Acetylene on hydration gives aldehydes while all other alkynes produce ketones,

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