Question

The order of reactivities of methyl halide in the formation of Grignard reagent is:

• A. $C{{H}_{3}}Cl>C{{H}_{3}}Br>C{{H}_{3}}I$
• B. $C{{H}_{3}}I>C{{H}_{3}}Br>C{{H}_{3}}Cl$
• C. $C{{H}_{3}}Br>C{{H}_{3}}I>C{{H}_{3}}Cl$
• D. $C{{H}_{3}}Br>C{{H}_{3}}Cl>C{{H}_{3}}I$

Answer 1

Answer: (B)

$C{{H}_{3}}I>C{{H}_{3}}Br>C{{H}_{3}}Cl$

Answer 2

Order of electro negativities of halogens are: $F>Cl>Br>I$ Hence, the order of reactivities of methyl halide in the formation of Grignard reagent is $CH_3I > CH_3Br > CH_3Cl$