What will be the final major product?

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(C) The molecule contains both an epoxide ring and a thiirane (episulfide) ring. $RMgX$ acts as a nucleophile and attacks the more strained thiirane r

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(C) The molecule contains both an epoxide ring and a thiirane (episulfide) ring. $RMgX$ acts as a nucleophile and attacks the more strained thiirane ring. The sulfur atom acts as a better nucleophile than oxygen due to its larger size and polarizability. After the initial attack by $R^-$,the resulting thiolate ion performs an internal $S_N2$ reaction on the epoxide ring,leading to the opening of the epoxide and the formation of a new cyclic structure. The oxygen atom in the epoxide is labeled with $^{18}O$. Finally,the resulting alkoxide ion reacts with $CH_3-I$ to form an ether. The final product is the one where the $^{18}O$ is part of the methoxy group attached to the ring system.

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