Pentane with molecular formula C5H12, exists in three isomeric forms. One shows linear carbon chains, another has one - CH3 groups present on the third carbon atom, and the third has two - CH3 groups present on the second carbon atom. What types of isomers are these?

a) geometric isomers

b) structural isomers

c) halo-tropic isomers

Pentane with molecular formular C5H12 exists in three isomeric forms which are normal pentane, isopentane and neopentane. These isomers are structural isomers. Structural isomers are chemical compounds which have the same molecular formular and but different space arrangements. The order in which they are arranged is the only difference between them.