The major product [R] in the following sequen | vedclass

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(B) Step $1$: Acetylene reacts with $LiNH_2$ followed by $2$-bromopropane to form $3,4$-dimethylpent-$1$-yne.Step $2$: Hydration of the alkyne using $

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(B) Step $1$: Acetylene reacts with $LiNH_2$ followed by $2$-bromopropane to form $3,4$-dimethylpent-$1$-yne.Step $2$: Hydration of the alkyne using $HgSO_4 / H_2SO_4$ gives a ketone,which is then reduced by $NaBH_4$ to form an alcohol,$3,4$-dimethylpentan-$2$-ol.Step $3$: Acid-catalyzed dehydration of the alcohol using $Conc. H_2SO_4 / \Delta$ follows $Saytzeff$ rule to form the most substituted alkene,which is $2,3$-dimethylpent-$2$-ene as the major product.

The major product $[R]$ in the following sequence of reactions is :-

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