# Refer to the below reaction:

The epoxidation reaction is

$\begin{array}{1 1}a)\;bimolecular\; nucleophilic\; addition\\b)\;Unimolecular\; nucleophillic\; addition\\c)\;Unimolecular\; electrophillic\; addition\\d)\;Bimolecular\; electrophillic \;addition\end{array}$

The reaction is bimolecular because both olefin and peracid are involved
Hence (d) is the correct option.