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Haloalkanes and Haloarenes
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Organometallic reagents: Grignard and organolithium
JEE Main level
Single correct option
Difficulty 2 of 3
hx080
For the formation of ethylmagnesium halide with magnesium in dry ether, the order of reactivity of the ethyl halides is
A
C
X
2
H
X
5
Br
>
C
X
2
H
X
5
Cl
>
C
X
2
H
X
5
I
B
C
X
2
H
X
5
Cl
>
C
X
2
H
X
5
Br
>
C
X
2
H
X
5
I
C
C
X
2
H
X
5
I
>
C
X
2
H
X
5
Br
>
C
X
2
H
X
5
Cl
D
C
X
2
H
X
5
Br
>
C
X
2
H
X
5
I
>
C
X
2
H
X
5
Cl
Answer: C
Magnesium insertion breaks the C-X bond, which is weakest for iodine and strongest for chlorine. Reactivity therefore follows
RI
>
RBr
>
RCl
.
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