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JEE Main · 2024 · 31 Jan 2024 · Shift 1 · General Organic Chemistry

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Given below are two statements:
Statement I: IUPAC name of is 7-hydroxyheptan-2-one.
Statement II: 2-oxoheptan-7-ol is the correct IUPAC name for above compound.
In the light of the above statements. choose the most appropriate answer from the options given below:
  1. (A)Statement I is correct but Statement II is incorrect.✓ Correct
  2. (B)Both Statement I and Statement II are incorrect.
  3. (C)Both Statement I and Statement II are correct.
  4. (D)Statement I is incorrect but Statement II is correct.

Answer: (A)

Solution

has a ketone (principal characteristic group, higher seniority than the alcohol) and a hydroxyl group. The ketone must be expressed as the suffix, and numbering must give it the lowest locant. Numbering from the end nearer the carbonyl carbon, the chain is a heptan-2-one with a hydroxyl at C-7: 7-hydroxyheptan-2-one -- correct.

"2-oxoheptan-7-ol" incorrectly uses the lower-seniority group (alcohol) as the suffix while the higher-seniority ketone is relegated to a prefix -- this is not valid IUPAC nomenclature.

So Statement I is correct, Statement II is incorrect.

JEE Main · 2024 · 31 Jan 2024 · Shift 1 · Single correct option

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