(+)-carvone and differ in the orientations of the substituents around which of the following carbon atoms?
a ) carbon 2 only
b ) carbon 5 only
c ) carbons 2 and 5 only
d ) carbons 2, 5, and 7 only

The correct option is: B. Carbon 5 only

Explanation:

Carvone is a naturally-occurring monoterpenoid consisting of a six-membered cyclic ring. The carbon-5 of this cyclic ring of Carvone is chiral, due to which Carvone exhibits enantiomerism.

The two enantiomeric forms of Carvone are: R-(–)-carvone, or L-carvone, and S-(+)-carvone, or D-carvone.

These two enantiomeric forms differ in the orientation of the substituents on the chiral carbon-5.

Therefore, the correct option is B. Carbon 5 only.