Cycloaddition reaction of carbene generated by the photolysis of diazo methane in inert gas with cis-2-butene is not stereospecific. Explain with the help of steps involved in the reaction

In the cycloaddition reaction of a carbene generated from the photolysis of diazomethane with cis-2-butene, the lack of stereospecificity arises due to the involvement of a concerted mechanism rather than a stepwise one.

When diazomethane undergoes photolysis, it generates a carbene intermediate:

\[ \text{CH}_2 \text{N}_2 \xrightarrow{\text{hv}} \text{CH}_2 + \text{N}_2 \]

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