The acid that cannot be prepared by Grignard reagent is.

Acetic acid

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Formic acid

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Butyric acid

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Benzoic acid

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Solution

The correct option is A Formic acid
Formic acid (containing only one C atom) cannot be prepared by Grignard reagent. The acid that can be prepared by Grignard reagent should contain a minimum of two carbon atoms. An example is as shown below.
$C O_{2} + C H_{3} - M g I \to C H_{3} - C O O - M g I H^{+} - ----- \to h y d r o l y s i s C H_{3} - C O O H + M g (I) O H$

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R - X + M g E t_{2} O - -- \to R M g X

A r - X + M g E t_{2} O - -- \to A r M g X

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