Q5 · CSIR-NET Chemistry, June 2013
Paper: CSIR-NET June 2013 · Subject: Organic Chemistry · Chapter: General Organic Chemistry · Topic: General Organic Chemistry – General · Marks: 2 · Difficulty: Medium
In the compound given below, the hydrogens marked A and B are 
(a)Homotopic
(b)Isotopic
(c)Enantiotopic
(d)Diastereotopic
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
cis-2,6-Diphenylpiperidin-4-one is meso, and the N–CH₂COOH carbon lies on its mirror plane. Replacing H_A or H_B gives enantiomers, so they are enantiotopic (c).
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