Question

For a molecule given, select the correct statement(s). $C{H}_3-CH=C=CH-CH=C=C=CH-CH=C=CH-C{H}_3$

• A. It has only one optically inactive form, in its trans geometrical isomer
• B. It can show geometrical and as well as optical isomerism.
• C. Total stereoisomers possible is 4.
• D. Two pairs of enantiomers are possible.

Answer 1

Answer: (A), (B), (D)

The correct options are
A It has only one optically inactive form, in its trans geometrical isomer
B It can show geometrical and as well as optical isomerism.
D Two pairs of enantiomers are possible.

Three double bonds on $C_4,C_5,C_6,C_7$ is equivalent to having one double bond and can exhibit geometrical isomerism.

Two allenic bonds corresponds to two chiral centres and exhibit optical isomerism.

The symmetrical molecule with two chiral centre has a pair of enantiomers and a mesomer. Since the molecule has a double bond, it will have a total of six isomers with each geometrical isomers has a pair of enatiomers and a mesomer.




Cis form

Trans form