Question

The most acidic hydrogen atoms are present in.

• A. Ethane
• B. Ethene
• C. Ethyne
• D. Benzene.

Answer 1

Answer: (C)

Ethyne

Answer 2

: As the s-character increases, acidity of hydrogen atom increases.

Ethane : $\mathrm { CH } _ { 3 } - \mathrm { CH } _ { 3 }$ 25% s-character

Ethane : $\mathrm { CH } _ { 2 } = \mathrm { CH } _ { 2 }$ 33% s-character

Ethane : $\mathrm { CH } \equiv \mathrm { CH }$ 50% s-character

Benzene :$\mathrm { C } _ { 6 } \mathrm { H } _ { 6 }$ $\mathrm { sp } ^ { 3 }$ 33% s-character