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

Formation of four isomeric monochlorides indicates the presence of four equivalent sets of hydrogen atoms marked a, b, c, d. Thus, the structure should be :
`oversetaCH_3 - underset(""_aCH_3) underset(|)oversetb(CH) - oversetcCH_2 - oversetd(CH_3)`