Choose the correct answer among the alternatives given:
Addition of water to alkynes occurs in acidic medium and in the presence of $H g^{2 +}$ ions as a catalyst.

Which of the following products will be formed on addition of water to but-l-yne under these conditions?

C H_{3} C H_{2} C H_{2} C H O

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C H_{3} C H_{2} C O C H_{3}

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C H_{3} C H_{2} C O O H + C O_{2}

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C H_{3} C O O H + H C H O

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Solution

The correct option is B $C H_{3} C H_{2} C O C H_{3}$
$C H_{3} C H_{2} C \equiv C H B u t - 1 - y n e H^{+} / H_{2} O, H g^{2 +} - -------- \to C H_{3} C H_{2} C O C H_{3} B u t a n - 2 - o n e$

When but-1-yne is treated with water in acidic medium gives,

$C H_{3} C H_{2} C \equiv C H ⟶ C H_{3} C H_{2} C (O H) = C H_{2}$

It undergoes rearrangement to give

$C H_{3} C H_{2} C (O H) = C H_{2} ⟶ C H_{3} C H_{2} C O C H_{3}$

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