Question

Of the five isomeric hexanes, the isomer which can give two monochlorinated compounds is
(a) n - hexane
(b) 2,3 - dimethylbutane
(c) 2,2 - dimethylbutane
(d) 2 - methylpentane

Answer 1

(b) : The number of monohalogenation products obtained from any alkane depends upon the number of different types of hydrogen it contains.

2,3 - dimethylbutane has two types of hydrogen atoms so on monochlorination gives only two monochlorinated compounds.