ABC26OR0019 · General Organic Chemistry
Subject: Organic Chemistry · Chapter: General Organic Chemistry · Topic: General Organic Chemistry – General · Exam: CSIR-NET JUNE 2013 · 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 (as printed): C
Explanation
Substitution of HA and HB gives different products, thus HA and HB are heterotopic. Heterotopic ligands are enantiotopic if replacement of one and then the other by a different achiral ligand gives rise to two enantiomers.
Explanation as extracted from the printed page; notation may be imperfect.