Question

Which of the following are correct structural isomers of butane ?

A. (i) and (iii)
B. (ii) and (iv)
C. (i) and (ii)
D. (iii) and (iv)

Answer 1

Correct Answer - A
Structure (i) is n-butane
structure (iii) is iso-butane
Since, molecular formula is same, only structures are different. So, (i) and (iii) are isomers while structure (ii) and (iv) have molecular formula `C_(4)H_(8)`.