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Question

In the following compound, according to the rules of IUPAC nomenclature, the groups designated as A, B, C will be numbered as .


A
1, 2, 4
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B
5, 1, 2
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C
3, 1, 6
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Solution

The correct option is B 5, 1, 2

The given compound has a cyclohexane ring with three substituents.

Where

A = CH3 (methyl group)

B = OH (hydroxyl or alcohol group)

C= CH3|CHCH3 (isopropyl group)

Clearly -OH is the principal functional group. The substituent C could be named in 2 ways

1. isopropyl

2. (1-methyl ethyl)

Either way, the carbon attached to OH gets numbered 1. Substituents C and A will be numbered 2 and 5 respectively according to lowest set of locants rule. After numbering the carbon attached to OH as '1', the numbering proceeds in a way to assign the lowest number to the carbon at which the first point of difference occurs.

Ans: ABC512


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