Among the following compounds, strongest acid is

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$C_{6} H_{6}$

$C H_{3} O H$

$C_{2} H_{6}$

$H C \equiv C H$

answer is D.

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Detailed Solution

In ethane $(C_{2} H_{6})$ and benzene $(C_{6} H_{6})$ hydrogen atoms are present on $s p^{3}$ and $s p^{2}$ hybridised carbon atom, so these are very weak acids as compared to $C H \equiv C H$ (having $s p$ carbon) and $C H_{3} O H$ (having electronegative oxygen) To decide whether $C H \equiv C H$ or $C H_{3} O H$ is a stronger acid, consider the following reaction.

$H C \equiv C^{-} N a^{+} + \underset{(s t r o n g e r a c i d)}{C H_{3} O H} \to \underset{(w e a \ker a c i d)}{H C} \equiv C H + C H_{3} O^{-} N a^{+}$

Since a stronger acid displaces a weaker acid from its salts, therefore, $C H_{3} O H$ is a stronger acid than $H C \equiv C H$ . Alternatively, $C H_{3} O^{-}$ is weaker base than $H C \equiv C^{-}$ because oxygen can accommodate negative charge easily.