1.

A hydrocarbon C_(5)H_(10) does not react with chlorine in dark but gives a single monochloro compound C_(5)H_(9)Cl in bright sunlight. Identify the hydrocarbon .

Answer»

SOLUTION :(i) The hydrocarbon with MOLECULAR formula`C_(5)H_(10)` can be either a cycloalkane or an alkene .
(ii) Since the hydrocarbon does not react with `Cl_(2)` in the DARK , it cannot be an alkene. Thus, it must be a cycloalkane.
(III) Since the cycloalkane reacts with `Cl_(2)` in the presence of bright sunlight , to give a single monochloro compound , `C_(5)H_(9)Cl`, all the hydrogen atoms of the cycloalkane must be EQUIVALENT. Thus, the cycloalkane is cyclopentane.


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