What is the gas liberated when alkaline formaldehyde solution is reacted with hydrogen peroxide in the presence of pyrogallol?

H_{2}

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O_{2}

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C H_{4}

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C O_{2}

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Solution

The correct option is B $H_{2}$
Reaction with acidic formaldehyde
Step 1: $H C H O + H_{2} O_{2} \to H C O O H + H_{2} O$
Step 2: $H C O O H + H_{2} O_{2} \to 2 H_{2} O + C O_{2}$

Reaction with alkaline formaldehyde
$2 H C H O + 2 N a O H + H_{2} O_{2} \to 2 H C O O N a + 2 H_{2} O + H_{2}$

Option A is correct.

Step 1:	$H C H O + H_{2} O_{2} \to H C O O H + H_{2} O$
Step 2:	$H C O O H + H_{2} O_{2} \to 2 H_{2} O + C O_{2}$

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