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

1, 2, 4

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1, 3, 4

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3, 1, 6

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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 = $- C H_{3}$ (methyl group)

B = $- O H$ (hydroxyl or alcohol group)

$C = C H_{3} - | C H - C H_{3}$ (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 $- O H$ 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 $- O H$ 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: (d) $\begin{matrix} A & B & C 5 & 1 & 2 \end{matrix}$

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Similar questions

The decreasding order of priority for the following functional groups (for IUPAC nomenclature) is:
(1) $- C O N H_{2}$ > (2) $- C \equiv N$ > (3) $- C H O$ > (4) $- O | | C -$

(1) $- C \equiv N$ , (2) $- C O N H_{2}$ , (3) $- O | | C -$ , (4) $- C H O$
The decreasing order of priority for the given functional groups (for IUPAC nomenclature) is:

Q. Write the following rational numbers according to convention.

(1)

\frac{5}{- 1}

(2)

\frac{- 5}{- 1}

(3)

\frac{2}{- 9}

(4)

\frac{- 2}{- 9}

(5)

\frac{0}{- 4}

(6)

\frac{11}{- 8}

Q. In the following compound, groups designated as

A, B, C

will be numbered as:

Express each of the following as a rational number in the form $\frac{p}{q} :$

$(i) 6^{- 1} (i i) (- 7)^{- 1} (i i i) {(\frac{1}{4})}^{- 1} (i v) (- 4)^{- 1} \times {(\frac{- 3}{2})}^{- 1} (v) {(\frac{3}{5})}^{- 1} \times {(\frac{5}{2})}^{- 1}$

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