Question

a) n-butane and iso - butane are called isorners why​

Answer 1

Answer:

the meaning of isomers is iso- same

mers-parts

so nbutane and iso butane are same.

but differ in their structures

Answer 2

Answer:

Because their molecular formula are same but they have different structures.

Explanation:

In chemistry, isomers are molecules or polyatomic ions with identical molecular formulas — that is, same number of atoms of each element — but distinct arrangements of atoms in space.

n-butane and iso - butane both have molecular formula as C4H10