Question

Which of the following are ring-chain isomers?

• A.
• B.
• C.
• D.

Answer 1

Answer: (B), (C), (D)

The correct options are
B

C

D

(a) are position isomers. This is because, O atom is attached to $C_1$ & $C_2$ in the former and $C_1$ and $C_3$ is the latter respectively.

B, C and D all are correct.

In each case, true pair exhibits ring-chain isomerism.