In which of the following reactions 1,3-butad | vedclass

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(D) In $(a)$,a double dehydrohalogenation ($E_2$ mechanism) occurs using a strong base to yield $1,3$-butadiene. In $(b)$,acid-catalyzed dehydration o

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(D) In $(a)$,a double dehydrohalogenation ($E_2$ mechanism) occurs using a strong base to yield $1,3$-butadiene. In $(b)$,acid-catalyzed dehydration of $1,4$-butanediol occurs to yield $1,3$-butadiene. In $(c)$,partial hydrogenation of vinylacetylene $(but-1-en-3-yne)$ using $Ni_2B$ ($P$-$2$ catalyst) selectively reduces the triple bond to a double bond to yield $1,3$-butadiene.

In which of the following reactions $1,3$-butadiene will be obtained as a major product?

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