Amongst the following,the major product of th | vedclass

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(A) The reaction of $3,4-dihydro-2H-pyran$ with $Br_2$ in the presence of $CH_3OH$ proceeds via the formation of a cyclic bromonium ion intermediate.

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(A) The reaction of $3,4-dihydro-2H-pyran$ with $Br_2$ in the presence of $CH_3OH$ proceeds via the formation of a cyclic bromonium ion intermediate. $1.$ $Br_2$ adds to the double bond to form a cyclic bromonium ion. $2.$ The nucleophile $CH_3OH$ attacks the more substituted carbon atom of the bromonium ion due to electronic effects and the stability of the transition state. $3.$ This results in an anti-addition product where the $-OCH_3$ group and the $-Br$ atom are in a trans-configuration relative to each other. Thus,the major product is the one where $-Br$ and $-OCH_3$ are trans to each other.

Amongst the following,the major product of the given chemical reaction is $.....$ .

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