does not react with chlorine in dark but gives a single monochloro compound 
in bright sunlight.Identify the hydrocarbon.
Answer:
. Which isomer reacts in dark which in sunlight. Then give the reactions.
(i) Molecular formula 
can be either alkene or cycloalkane.
(ii) Since, the hydrocarbon does not react with chlorine in dark, it isnot an alkene. So, it is a cycloalkane, i.e., cyclopentane.
(iii) Since, it forms only single monochloro derivative in brightsunlight, all the H-atoms should be identical. So, it iscyclopentane.
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