Question

Amides are less basic than amines.

Hint:

The basicity of amines is higher than amides because the lone pair on the nitrogen in amides is less available due to resonance with the carbonyl group.

Answer 1

Why Amides Are Less Basic Than Amines 

Basicity in nitrogen-containing compounds depends on the availability of the nitrogen’s lone pair of electrons for protonation. Here's how it differs between amides and amines:

Amides:

• The nitrogen atom in an amide is bonded to a carbonyl group (C=O).
• The lone pair on the nitrogen is delocalized via resonance with the carbonyl group:
• This resonance effect reduces the availability of the lone pair for accepting a proton (H⁺).
• As a result, amides are less basic.

Amines:

• Amines lack the adjacent carbonyl group.
• The lone pair on nitrogen is localized and readily available for protonation.
• This makes amines significantly more basic than amides.

Conclusion: The resonance stabilization in amides withdraws electron density from the nitrogen, decreasing its basicity, whereas amines retain full availability of the nitrogen lone pair, making them more basic.