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If the bond length of C-Cl bond in chloromethane is 178pm, what will be the probable bond length of C-Br bond in bromomethane?(a) 139pm(b) 156pm(c) 178pm(d) 193pmThe question was asked during an online interview.This question is from Nature of C-X Bond in section Haloalkanes and Haloarenes of Chemistry – Class 12

Answer»

The correct choice is (d) 193pm

For explanation I would SAY: The size of Cl atom is smaller than the size of Br atom as the latter APPEARS LOWER than Cl in the HALOGEN group. Hence, the carbon-halogen bond length of C-Br must be bigger than that of C-Cl, i.e., 178pm, THEREFORE it must be 193pm.



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