Which of the following reaction will not be favourable in the forward direction?

C H_{3} O N a + C H_{3} C O O H \to C H_{3} O H + C H_{3} C O O N a

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P h O N a + N H_{3} \to P h O H + N a N H_{2}

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H C \equiv C H + N a N H_{2} \to H C \equiv C N a + N H_{3}

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H C O O H + P h O N a \to H C O O N a + P h O H

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Solution

The correct option is B $P h O N a + N H_{3} \to P h O H + N a N H_{2}$
Direction of equilibrium in acid base reaction is from unstable reactant towards stable product.
In option B $P h O^{-}$ is more stable than $N H_{2}^{-}$ . So, it doesn't react readily with $N H_{3}$ .
In all other options the reactants are less stable than the products. So, the option B is the correct answer.

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