Assertion : Butane and isopentane are homologues.
Reason : Butane is a straight chain atkane while isopentane is a branched chain alkane.

Assertion : Butane and 2-methylbutane are homologues. Reason : Butane is a straight chain alkene while 2-methylbutane is a branched chain alkene.

Assertion : Butane and 2- methyl butane are chain isomers. Reason : Butane is a straight chain alkane while 2- methyl butane is a branched chain alkane.

Assertion (A) : Pentane and 2-methyl pentane are homologous. Reason (R ) : Pentane is a straight-chain alkane, while 2-methyl pentane is a branched-chain alkane.

Assertion (A) : Pentane and 2-methy1 pentane are homolo-gues. Reason (R ) : Pentane is a straight-chain alkane, while 2-methy1 pentane is a branched-chain alkane.