A) \[C{{H}_{3}}CHO+HCN\xrightarrow{{}}\]
B) Ethene \[\xrightarrow{{{H}^{+}},{{H}_{2}}O}\]
C) Ethyne \[\xrightarrow[CC{{l}_{4}}]{B{{r}_{2}}}\]
D) Ethene \[\xrightarrow{HCl}\]
Correct Answer: A
Solution :
The reaction \[C{{H}_{3}}CHO+HCN\xrightarrow{{}}\] is the only nucleophilic addition reaction.
acetone cyanohydrin Addition of halogens \[({{X}_{2}})\], halogen acids (HX), hypochlorous acid \[(HOCl),\,\,{{H}_{2}}S{{O}_{4}}\] and \[{{H}_{2}}O\] on olefins and alkynes are examples of electrophilic addition reactions. The mechanism is: 
addition product
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