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Account for the following: (a) The C-Cl...

Account for the following:
(a) The C-Cl bond length in chloro-benzene is shorter than that in `CH_3 - Cl`.
(b) Chloroform is stored in closed dark brown bottles.

Text Solution

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(i) This is due to partial double bond character of C - Cl bond in chlorobenzene due to resonating structures.
(ii) Chloroform in the presence of air gets oxidised to phosgene which is poisonous our compand- Phosgene is carbonyl chloride and is represented as `COCl_2`. To prevent the formation of phosgene, chloroform is stored in dark coloured bottles. The reaction is represented as.
`CHCl_3+1/2O_2toCOCl_2+HCl`.
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