Which of the following compounds will not give effervescence $(C O_{2})$ with $N a H C O_{3}$ ?

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Solution

The correct option is A
Feasibility of Reaction :
Strong acid displaces weak acid from the salt of weak acid.
Similarly, strong base can displace weak base from the salt of weak base.
Order of acidic strength :
$P h - S O_{3} H > P h - C O O H > H_{2} C O_{3} > P h - O H$
Since phenol is less acidic than $H_{2} C O_{3}$ , so it will not produce $C O 2$ with $N a H C O_{3}$ .
In case of (b) , $- N O_{2}$ group at ortho and para decrease the electron density due to electron withdrawing effect, making it more acidic than phenol.
Reaction of benzoic acid(stronger acid than $H_{2} C O_{3}$ ) with $N a H C O_{3}$ is:

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Which of the following gives effervescences of $C O_{2}$ with $N a H C O_{3}$ solution ?

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