ABC26OR0161 · Photochemical Reactions

Subject: Organic Chemistry · Chapter: Photochemical Reactions · Topic: Photocycloaddition · Exam: CSIR-NET JUNE 2011 · Marks: 2 · Difficulty: Medium

The concerted photochemical reaction between two olefins leading to a cyclobutane ring is:

(a)$pi 2mathrm{s}+pi 2mathrm{a}$ cycloaddition

(b)$pi 2mathrm{s}+pi 2mathrm{s}$ cycloaddition

(c)$sigma 2mathrm{s}+sigma 2mathrm{s}$ cycloaddition

(d)$\pi 2 \mathrm{s}+\sigma 2 \mathrm{a}$ cycloaddition

Answer

Answer (as printed): B

Explanation

HOMO of one alkene reacts with LUMO of other, LUMO HOMO HOMO Detailed Mechanism,

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