The number of $π -$ bonds in the product formed by passing acetylene through dil. $H_{2} S O_{4}$ containing mercuric sulphate is:

zero

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one

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two

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three

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Solution

The correct option is B one
Acetylene undergoes hydration in the presence of dil sulphuric acid and mercuric sulphate to form acetaldehyde( $C H_{3} C H O$ ). The reaction can be written as:
$H C \equiv C H + H_{2} O H^{+}, H g^{2 +} - ----- \to H_{3} C - C H O$

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