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(B) The reaction involves the treatment of a vicinal dibromide (trans$-1,2-$dibromocyclohexane) with sodium iodide $(NaI)$ in acetone. This is a class

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(B) The reaction involves the treatment of a vicinal dibromide (trans$-1,2-$dibromocyclohexane) with sodium iodide $(NaI)$ in acetone. This is a classic example of a debromination reaction. $1$. The iodide ion $(I^-)$ acts as a nucleophile and attacks one of the bromine atoms,while the other bromine atom leaves as a bromide ion $(Br^-)$. $2$. This process is a concerted $E2$ elimination reaction. $3$. For the elimination to occur,the two bromine atoms must be in an anti-periplanar conformation. In the trans$-1,2-$dibromocyclohexane,the bromine atoms are in an anti-periplanar orientation,which facilitates the elimination of $Br_2$ to form a double bond between the two carbons. $4$. Consequently,the major product of this reaction is cyclohexene.

What is the major product of the reaction shown below?

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