Which of the following order of acidic strength is correct :

R C O O H > R O H > H O H > H C \equiv C H

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R C O O H > H O H > R O H > H C \equiv C H

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R C O O H > H O H > H C \equiv C H > R O H

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R C O O H > H C \equiv C H > H O H > R O H

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Solution

The correct option is B $R C O O H > H O H > R O H > H C \equiv C H$
$R C O O H$ is an acid, Electron-releasing alkyl group $R$ in $R O H$ makes it lesser acidic than $H O H$ . $C H \equiv C H$ has high electron density making it least acidic.

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