Q98 · CSIR-NET Chemistry, June 2011
Paper: CSIR-NET June 2011 · Subject: Organic Chemistry · Chapter: Photochemical Reactions · Topic: Photocycloaddition · Marks: 2 · Difficulty: Medium
The concerted photochemical reaction between two olefins leading to a cyclobutance ring is :
(a)$\pi 2 \mathrm{s}+\pi 2 \mathrm{a}$ cycloadition
(b)$\pi 2 \mathrm{s}+\pi 2 \mathrm{s}$ cycloaddition
(c)$\sigma 2 s+\sigma 2 s$ cycloaddition
(d)$\pi 2 \mathrm{s}+\sigma 2 \mathrm{a}$ cycloaddition
Answer
Answer: B ✓ checked by 4AB · confidence high
The source book printed no answer; this one was worked out and checked — see the explanation.
Explanation
A photochemical [2+2] of two alkenes is π2s + π2s (b).
Study loop for Photochemical Reactions
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