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Conductivity MP BP and Electronegativity (Group 2)

Mg metal reac...

Question

$M g$ metal reacts with alkyl bromide best in:

A

C_{2} H_{5} O C_{2} H_{5}

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B

C_{6} H_{5} O C H_{3}

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C

C_{6} H_{5} N (C H_{3})_{2}

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D

equally in all

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Solution

The correct option is B $C_{2} H_{5} O C_{2} H_{5}$
Although Grignard reagent can be prepared in all the three solvents, $C_{2} H_{5} O C_{2} H_{5}$ is the best because electrons on oxygen atom in $C_{6} H_{5} O C H_{3}$ and N atom in $C_{6} H_{5} N (C H_{3})_{2}$ are partially delocalised over the benzene ring and hence are less available than electrons on $O$ in $C_{2} H_{5} O C_{2} H_{5}$ for coordination with magnesium ( $M g$ ).

Hence, the correct option is $A$

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