Which of the following will undergo acid-base reaction with Grignard reagent?

H C \equiv C H

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R - O H

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R - C O_{2} H

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All of these

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Solution

The correct option is D All of these
$R - X + M g E t_{2} O - -- \to R M g X$ (Grignard Reagent)

$A r - X + M g E t_{2} O - -- \to A r M g X$ (Grignard Reagent)

A. $H - C \equiv s p C δ + - H δ - R M g X - ----- \to o r A r M g X R H$ or $A r H$

B. $R - δ + O δ - H R M g X - ----- \to o r A r M g X R H$ or $A r H$
$O$
C. $R - | | C - O δ - - H δ - R M g X - ----- \to o r A r M g X R H$ or $A r H$

Acetylene, alcohol and carboxylic acid all contains acidic hydrogen and Grignard reagent acting as strong base can take up proton.
Therefore, D is correct option.

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