Among the isomeric alkanes of molecular formula `C_(5)H_(12)`, identify the one that on photochemical chlorination yields
(i) A single monochloride.
(ii) Three isomeric monochlorides.
(iii) Four isomeric monochlorides.

Explanation

The molecular formula `C_(5)H_(12)` represents three structural isomers which are chain isomers.
(i). The isomer is symmetrical with four primary `(1^(@))` carbon atoms and one quaternary `(4^(@))` carbon atom. Sicne all the hydrogen atoms are equivalent, it will yields only one monochloride upon photochlorination i.e., chlorination carried in the presence of ultra-violet light.
(ii). In the straight chain isomer pentane, there are three groups of equivalent hydrogen atoms. As a result three isoemeric monochlorides are possible.
(iii). the branched chain isomer has four types of equivalent hydrogen atoms present. it will give four isomeric monochlorides upon chlorination.



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