Grignard reagent is usually prepared by :

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

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

Grignard reagent acts as a strong base. Grignard reagent carry out nucleophilic attack in absence of acidic hydrogen. Grignard reagent form complex with its ether solvent. Complex formation with molecule of ether is an important factor in the formation and stability of Grignard reagent.

Which of the following Grignard reagents are not possible ?

H S - C H_{2} - C H_{2} - C H_{2} M g B r

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H O - C H_{2} - C H_{2} - C H_{2} M g B r

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N H_{2} - C H_{2} - C H_{2} - C H_{2} M g B r

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All of these

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Solution

The correct option is D All of these
(A) $δ + H - S - C H_{2} C H_{2} C H_{2} - M g B r a c i d - b a s e - ----- \to r e a c t i o n B r M g S - C H_{2} C H_{2} C H_{3}$

(B) $H - O - C H_{2} C H_{2} C H_{2} M g B r a c i d - b a s e - ----- \to r e a c t i o n B r M g O - C H_{2} C H_{2} C H_{3}$

(C) $δ + H - N | - C H_{2} C H_{2} - C H_{2} - M g B r a c i d - b a s e - ----- \to r e a c t i o n B r M g - N | - C H_{2} C H_{2} C H_{3}$
$δ^{+} H$ $H$

So, all of these Grignard reagent can take their own acidic hydrogen. Therefore all of these Grignard reagents are not possible.

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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

E t 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

A Grignard reagent is prepared by the action of magnesium in dry ether on

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