Reaction of ethyne with HCN in presence of Ba (CN)2 is an example of:a)Electrophilic additionb)Nucleophilic additionc)Free radical additiond)Electrophilic substationCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

Nucleophilic addition reaction is a type of addition reaction in which a nucleophile attacks an electron-deficient species, resulting in the formation of a new bond. The given reaction of ethyne with HCN in the presence of Ba (CN)2 is an example of nucleophilic addition reaction. Let's understand the reaction mechanism in detail:

Reaction Mechanism:

Step 1: Formation of the carbocation
In the presence of Ba (CN)2, HCN acts as a nucleophile and attacks the carbon atom of ethyne, resulting in the formation of a carbocation intermediate.

HCN + C2H2 → [C2H2]+ + HCN-

Step 2: Attack of nucleophile
The cyanide ion (CN-) acts as a nucleophile and attacks the carbocation intermediate, resulting in the formation of a new bond between the carbon and nitrogen atoms.

CN- + [C2H2]+ → H-C≡C-C≡N

Step 3: Formation of the product
The final product formed is 2-cyanoethene.

2 H-C≡C-C≡N → C6H4N2

Therefore, the given reaction is an example of nucleophilic addition reaction.

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