Carbene intermediates are produced by the photolysis of diazomethane `(CH_2N_2)` or kenene `(CH_2 = C = O)`. They are also produced by the reaction of `CHX_3` with base or by Simmons-Smith reaction. There are two types of carbenes, singlet and triplet. They are so called due to their spin state.
An optically active alkene `(I)` with lowest molecular mass on hydrogenation gives optically inactive alkene, but on insertion of methylene carbene `( : CH_2)` in `(I)`, it gives optically active compound `(II)`. The compounds `(I)` and `(II)` are :
.

Options

A. P
B. P,R
C. P,Q,
D. P,Q,R

Answer

C

Explanation

(c ) In `P` and `Q`, both `(I)` and `(II)` are optically active.