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Polymerisation of Alkynes

Which of the ...

Question

Which of the following statements about Grignard reagent is false?

A

Grignard reagents (RMgBr) add to the carbonyl group of aldehydes and ketones

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B

An organosodium compound is not very reactive compared to a Grignard reagent

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C

Grignard reagents are prepared in ether or tetrahydrofuran (THF)

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D

Grignard reagents are decomposed by water and alcohol

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Solution

The correct option is A An organosodium compound is not very reactive compared to a Grignard reagent
Answer: $B$
Explanation: It is supposed that the $M g - C$ bond is strongly polar covalent, not ionic. Grignard’s reagents are less reactive than organosodium, -potassium and -lithium compounds, that is the reason why it is more convenient to work with them.

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