Which reagent is used for the following trans | vedclass

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(B) The transformation of $1,2-dibromoethane$ to $ethyne$ involves dehydrohalogenation. $1$. First,$1,2-dibromoethane$ reacts with alcoholic $KOH$ to

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Alcoholic $KOH$ followed by $NaNH_2$

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(B) The transformation of $1,2-dibromoethane$ to $ethyne$ involves dehydrohalogenation. $1$. First,$1,2-dibromoethane$ reacts with alcoholic $KOH$ to undergo dehydrohalogenation,forming $vinyl$ $bromide$ $(CH_2=CHBr)$. $2$. Then,the stronger base $NaNH_2$ is used to remove the second molecule of $HBr$ from $vinyl$ $bromide$ to form $ethyne$ $(HC \equiv CH)$.

Which reagent is used for the following transformation? $Br-CH_2-CH_2-Br \rightarrow H-C \equiv C-H$

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