Question

Following statements are correct about nucleophilic reactions of alkynes
(A) Generally nucleophilic addition catalyzed by heavy metal cation
(B) Metal cation decreases electron density in alkyne
(C) Addition of water takes place in presence of (Hg+2)
(D) Sodium acetylide reacts with tertiary alkyl halide to form alkene as major product​

Answer 1

Answer:

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(D) Sodium acetylide reacts with tertiary alkyl halide to form alkene as major product

Answer 2

Correct about nucleophilic reactions of alkynes is (D) Sodium acetylide reacts with tertiary alkyl halide to form alkene as major product​

Explanation:

1.Nucleophilic substitution reactions are a class of reactions in which an electron rich nucleophile attacks a positively charged electrophile to replace a leaving group. For alginate reactions, the most reactive nucleophile is the C6 carboxylate group.

2.Nucleophilic addition reaction of alkynes is generally catalysed by the presence of heavy metal salts such as those of mercury and barium. The function of mercury ions (Hg2+) or barium ions (Ba2+) is to form 7r-complex by withdrawing the electron density from the. -cloud.

3.The clouds of electrons surrounding the sigma bond makes an alkyne an electron-rich molecule. They are therefore nucleophiles that react with electrophiles. Thus alkynes, like alkenes, undergo electrophilic addition reactions because of their weak pi bonds.