Question

The reaction of chlorine with pentane gives a mixture of three mono-chlorinated constitutional isomers. Name these three.

Answer 1

1-Chloropentane
2-Chloropentane
3-Chloropentane

Answer 2

Chlorine and pentane alone would probably not react. There needs to be a driving force to have a alkane react with chlorine.

But, halogenation of alkane generally forms the more stable product. Remember 3 > 2 > 1
in terms of tertiary, secondary, and primary...