A) Bromine, \[CC{{l}_{4}}\]
B) Hg Lindlars catalyst
C) Dilute \[{{H}_{2}}S{{O}_{4}},\,HgS{{O}_{4}}\]
D) Ammoniacal \[C{{u}_{2}}C{{l}_{2}}\]solution
Correct Answer: D
Solution :
1 - butyne has acidic hydrogen hence, reacts with\[C{{u}_{2}}C{{l}_{2}}/N{{H}_{4}}OH\] 2 - butyne without terminal hydrogen does not react.
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