A) bromine, \[CC{{l}_{4}}\]
B) \[{{H}_{2}}\], Lindlar catalyst
C) dilute \[{{H}_{2}}S{{O}_{4}}\], \[HgS{{O}_{4}}\]
D) ammonical \[C{{u}_{2}}C{{l}_{2}}\] solution
Correct Answer: D
Solution :
[d] Ammonical cuprous chloride gives precipitate (red) only with terminal alkynes, i.e. alkynes having acidic hydrogen atom, such as butyne-1 \[(CH\equiv CC{{H}_{2}}C{{H}_{3}})\]
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