Q53.
Ans: opt 4 can u explain why?

dear student
PCl5 changes both the OH into Cl 
and the next step is treatment with alc. KOH which causes elimination and a double bond is formed and then NaNH2 which is a very strong base and it converts the structure into triple bond 
.you have to remember that NaNH2 is a very strong base 
regards
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