Question

The number of geometrical isomers are :

Answer 1

Geometrical isomers have same molecular formula but a different arrangement of atoms in space.

$H_{3}C-CH=CH-CH=C{H}_3$, it is a symmetrical molecule.

No.of geometrical isomers$=2^n-2^{\frac{n-1}{2}}$

$n=1$

$\Rightarrow 2^1-2^{\frac{1-1}{2}}=2$

2- geometrical isomers i.e. cis and trans.