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JEE Advanced · 2025 · 18 May 2025 · Paper 2 · Chapter_pending

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Monocyclic compounds P, Q, R and S are the major products formed in the reaction sequences given below.

The product having the highest number of unsaturated carbon atom(s) is-
Structure P
P
Structure Q
Q
Structure R
R
Structure S
S
  1. (A)P
  2. (B)Q
  3. (C)R
  4. (D)S✓ Correct

Answer: (D)

Solution

Analyzing the reaction sequences:

P: Contains 2 unsaturated carbons (one C=C double bond)

Q: Contains 2 unsaturated carbons (one C=C double bond)

R: Contains 2 unsaturated carbons (one C=C double bond)

S: Contains 4 unsaturated carbons (two C=C double bonds in a diene system)

Therefore, product S has the highest number of unsaturated carbon atoms.

JEE Advanced · 2025 · 18 May 2025 · Paper 2 · Single correct option

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