The compound that does not give effervescence on reaction with $N a H C O_{3}$ is:

P h C H_{2} O H

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C H_{3} C O O H

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Solution

The correct option is A $P h C H_{2} O H$
Compounds that have a $p K a < 6.35$ give $C O_{2}_{(g)}$ on reaction with $N a H C O_{3}$ .
$P h C H_{2} O H$ is a very weak acid ( $p K a = 15.40$ ) so it does not do so.

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