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(B) The reaction proceeds via electrophilic addition to the alkyne. Step $1$: The addition of $DCl$ $(1 \ equiv)$ to $CH_3-C\equiv CH$ follows Markovn

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$CH_3C(I)(Cl)CHD_2$

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(B) The reaction proceeds via electrophilic addition to the alkyne. Step $1$: The addition of $DCl$ $(1 \ equiv)$ to $CH_3-C\equiv CH$ follows Markovnikov's rule. The electrophile $D^+$ adds to the terminal carbon to form the more stable secondary carbocation, followed by the attack of $Cl^-$. This yields $CH_3-C(Cl)=CHD$. Step $2$: The addition of $DI$ to the alkene $CH_3-C(Cl)=CHD$ follows Markovnikov's rule. The electrophile $D^+$ adds to the carbon already bearing the deuterium (to form a stable carbocation adjacent to the chlorine atom), followed by the attack of $I^-$. This results in the geminal dihalo-dideutero product $CH_3-C(I)(Cl)-CHD_2$.

The major product of the following reaction is $CH_3-C\equiv CH \xrightarrow[(ii) \ DI]{(i) \ DCl \ (1 \ equiv)}$

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