Q9 · CSIR-NET Chemistry, December 2011

Paper: CSIR-NET December 2011 · Subject: Organic Chemistry · Chapter: Reagents, Reaction Mechanisms & Named Reactions · Topic: Reduction Reagents · Marks: 2 · Difficulty: Easy

Under review — part of this question (a structure or an option) is not clear in the source scan. 4AB is checking it against the original book; the answer shown may change.
The major products A and B in the following reaction sequence are Question structure 1 of 9, ABC26OR0188 Question structure 2 of 9, ABC26OR0188 Question structure 3 of 9, ABC26OR0188 Question structure 4 of 9, ABC26OR0188 Question structure 5 of 9, ABC26OR0188 Question structure 6 of 9, ABC26OR0188 Question structure 7 of 9, ABC26OR0188 Question structure 8 of 9, ABC26OR0188 Question structure 9 of 9, ABC26OR0188
(a)Option (a) structure 1 of 6, ABC26OR0188 Option (a) structure 2 of 6, ABC26OR0188 Option (a) structure 3 of 6, ABC26OR0188 Option (a) structure 4 of 6, ABC26OR0188 Option (a) structure 5 of 6, ABC26OR0188 Option (a) structure 6 of 6, ABC26OR0188
(b)Option (b) structure 1 of 2, ABC26OR0188 Option (b) structure 2 of 2, ABC26OR0188
(c)Option (c) structure 1 of 2, ABC26OR0188 Option (c) structure 2 of 2, ABC26OR0188
(d)Option (d) structure 1 of 2, ABC26OR0188 Option (d) structure 2 of 2, ABC26OR0188
Answer
Under review — not yet confirmed.
Answer: D
Explanation
The stabilised ylide gives (E)-ethyl cinnamate; LiAlH₄ at −78 °C reduces only the ester to (E)-cinnamyl alcohol (A), and dihydropyran/TsOH gives its THP ether (B) — (d).

Study loop for Reagents, Reaction Mechanisms & Named Reactions

1. Practise the PYQsPrevious-year questions, with answers

· Browse this chapter in the app