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Question

The correct order of increasing C−X bond length is:
(R is methyl group)

A
RI>RBr>RCl>RF
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B
RF>RCI>RBr>RI
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C
RBr>RCl>RI>RF
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D
RCl>RF>RI>RBr
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Solution

The correct option is A RI>RBr>RCl>RF
CX bond length totally depends on atomic size of halogens . The more is the size more will be bond length. The atomic size of halogens is I>Br>Cl>F. Hence, the correct order of increasing C-X bond length is RI>RBr>RCl>RF.

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