CH_3CH=CH–CH_3 + CH_2N_2 h A. A is

JEE Main Chemistry question

CHCH=CH–CH + CHN . is

(A)*trans*-1,2-DimethylcyclopropaneCorrect
(B)*cis*-1,2-Dimethylcyclopropane
(C)Both (A) and (B)
(D)None of these

Answer: (A)

Solution

Photolysis of diazomethane generates the singlet carbene CH, which adds to the alkene's -bond in a concerted, stereospecific *syn* (suprafacial) cycloaddition that exactly

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Question ID VK-142447