Question

Draw E and Z isomers of pent 2 ene​

Answer 1

Answer : The E and Z isomers of pent-2-ene are shown below.

Explanation :

The configuration of the geometrical isomers is designated by two system which are, Cis-trans system and E-Z system.

The rules for E-Z system are :

The atoms or groups attached to each olefinic carbon are given priority as per the sequence rule.

If the higher priority groups are present on same sides across the double bond, the geometrical isomer is said to have Z-configuration or 'cis'.

If the higher priority groups are present on opposite sides across the double bond, the geometrical isomer is said to have E-configuration or 'trans'.

In the given compound, higher priority groups are $CH_3$ and $I$.

When $C_2H_5$ and $CH_3$ are present on same sides across the double bond, the geometrical isomer is said to have 'Z-configuration'.

When $C_2H_5$ and $CH_3$ are present on opposite sides across the double bond, the geometrical isomer is said to have 'E-configuration'.