The following two compounds are

Options

A. Geometrical isomers
B. Positional isomers
C. Functional group isomers
D. Optical isomers

Answer

B

Explanation

`H_(3) C - C = C - CH_(3)` (But-2-ene)
`H_(3) C - CH_(2) - CH = CH_(2)` (But-1-ene)
Both are differ in position of double bond hence they are positional isomers