Structure of naturally occurring steroide cholesterol is given:

Which of the following statements is/are correct ?

Options

A. (a) There are nine chiral in the cholesterol.
B. (b) It is a pentacyclo compound.
C. (c) There are two `4^(@)` C atoms in the compound.
D. (d) There are six `3^(@)` C atoms in the compound.

Answer

A, C, D

Explanation

Chiral centrea are at carbon number: 3, 5, 8, 9, 10, 13, 14, 17, and 20 (total nine chiral centres).
`4^(@)` C are at C-10 and C-13.
`3^(@)` are at C-8, C-9, C-14, C-17, C-20, and C-25.