question_answer

Which of the following is a syndiotactic polymer in \[-{{[-C{{H}_{2}}-C(YZ)-]}_{n}}-\]

A)                 All Y groups lie on one side of the chain and all Z groups on the other side

B)                 The Y and Z groups lie alternately on each side of the chain

C)                 The Y and Z groups are arranged in a random fashion

D)                 Y and Z groups are same

Correct Answer: B

Solution :

           There are 3 stereo chemical arrangements are possible (i)       Isotactic (Same order):- Here groups are arranged on one side of the chain. All Y groups lie on one side and all Z groups on the opposite side of the chain. (ii) Syndiotactic (Alternating order) - The Y and Z groups lie alternately on each side of the chain. (iii) Atactic (Random order) - The Y and Z groups are arranged in a random fashion.