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NEET 2022 · ChemistryPrevious Year Question

The correct IUPAC name of the compound shown (a six-carbon chain bearing at C1, at C3, a branch at C4, and at C5) is:

Answer: (A) (A) 1-bromo-5-chloro-4-methylhexan-3-ol. The group is the principal characteristic group, so the parent is hexan-3-ol and the chain is numbered to give the lowest locant: at C3.

NEET 2022 Chemistry question — The correct IUPAC name of the compound shown (a six-carbon chain bearing Br at C1, OH at…
  1. A.(A) 1-bromo-5-chloro-4-methylhexan-3-ol✓
  2. B.(B) 6-bromo-2-chloro-4-methylhexan-4-ol
  3. C.(C) 1-bromo-4-chloro-5-chlorohexan-3-ol
  4. D.(D) 6-bromo-4-chloro-4-chlorohexan-4-ol

Correct Answer

(A) (A) 1-bromo-5-chloro-4-methylhexan-3-ol

Solution & Explanation

The group is the principal characteristic group, so the parent is hexan-3-ol and the chain is numbered to give the lowest locant: at C3. This places at C1, the at C4, and at C5. Listing substituents alphabetically (bromo, chloro, methyl) gives 1-bromo-5-chloro-4-methylhexan-3-ol. Options C and D wrongly repeat 'chloro' and B uses the wrong numbering direction.

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