Q4 · CSIR-NET Chemistry, June 2013
Paper: CSIR-NET June 2013 · Subject: Organic Chemistry · Chapter: General Organic Chemistry · Topic: Nomenclature Polycyclics · Marks: 2 · Difficulty: Medium
The IUPAC name for the compound given below is 
(a)(2R, 3Z)-7-phenylhept-3-en-2-ol
(b)(2S, 3Z)-7-phenylhept-3-en-2-ol
(c)(2R, 3E)-7-phenylhept-3-en-2-ol
(d)(2S, 3E)-7-phenylhept-3-en-2-ol
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
The C3=C4 double bond of the chain is drawn trans (C-2 and C-5 on opposite sides), so it is 3E. At C-2 the priorities are OH > C-3 (vinyl) > CH₃ > H. OH is on a hash and H points toward the viewer; OH → C-3 → CH₃ runs clockwise, and because H is in front the descriptor reverses to S. Name: (2S,3E)-7-phenylhept-3-en-2-ol (d).
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