Increasing order of basicity:
General Organic Chemistry (GOC) · Class 11 · JEE Main Previous Year Question
Increasing order of basicity:
- a
(A) < (B) < (C) < (D)
- b
(D) < (A) < (B) < (C)
- c
(B) < (A) < (C) < (D)
- d✓
(B) < (A) < (D) < (C)
(B) < (A) < (D) < (C)
Step 1: Comparing Nitrogen Basicity Basicity depends on the availability of the nitrogen lone pair.
- (C) Pyrrolidine: nitrogen, localized lone pair. Most basic.
- (D) Imidazole: One nitrogen lone pair is localized (), the other is aromatic. Still fairly basic as the nitrogen can accept a proton.
- (A) Pyridine: nitrogen lone pair is localized but in a more electronegative orbital than .
- (B) Pyrrole: lone pair is involved in aromaticity (6π system). Least basic.
Step 2: Conclusion Order: (C) > (D) > (A) > (B).
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