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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 respectively as:


A

1, 2, 4

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B

1, 3, 4

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C

3, 1, 6

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D

5, 1, 2

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Solution

The correct option is D

5, 1, 2


The given compound has a cyclohexane ring with three substituents.


Where
A = - CH3 (methylgroup)
B = - OH (hydroxyl or alcohol group)
|C=CH3CHCH3(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.


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