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Q.

Structure of naturally occurring steroid cholesterol is given:

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Which of the following statements is/are correct?

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a

There are two 4° C atoms in the compound.

b

It is a pentacyclo compound.

c

There are nine chiral centres in the cholesterol.

d

There are seven 3° C atoms in the compound.

answer is A, C, D.

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Detailed Solution

Chiral centres 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° C are at C-5, C-8, C-9, C-14, C-17, C-20, and C-25.

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