Norrish Type 2 reaction of valerophenone involves

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B - $\gamma$-H abstraction followed by cleavage of $\beta$-bond. Norrish type II: the excited carbonyl abstracts a $\gamma$-H to give a 1,4-biradical, which cleaves the bond between the $\alpha$ and $\beta$ carbons (labelled the $\beta$-bond in the figure), giving the enol of acetophenone and an alkene.

Answer

A - $\gamma$-H abstraction followed by cleavage of $\alpha$-bond

Answer

C - $\gamma$-H abstraction followed by dimerization

Answer

D - $\alpha$-bond cleavage followed by radical coupling

Norrish Type 2 reaction of valerophenone involves

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