Which is the most precise designation of ster | vedclass

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(D) The electrophilic addition of $DBr$ to $1$-methylcyclohexene proceeds via the formation of a tertiary carbocation intermediate at the $C1$ positio

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both $(a)$ and $(b)$

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(D) The electrophilic addition of $DBr$ to $1$-methylcyclohexene proceeds via the formation of a tertiary carbocation intermediate at the $C1$ position.
Following the formation of the planar carbocation,the bromide ion $(Br^-)$ can attack from either the top or bottom face of the carbocation.
Since the deuterium atom $(D)$ adds to the $C2$ position,the resulting product can have the $D$ and $Br$ atoms in either a $cis$ or $trans$ configuration relative to each other.
Therefore,both $cis$ and $trans$ isomers are formed as products.

Which is the most precise designation of stereochemistry for the products formed in the electrophilic addition of $DBr$ to $1$-methylcyclohexene? ($D = {}^2H$,an isotope of hydrogen)

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