49. Ans(C) The ease with which the nitrogen atom can donate the electron pair is

Question

49. Ans(C)The ease with which the nitrogen atom can donate the electron pair is the criteria for comparing basicity here.

In 1, lone pair of electrons present on nitrogen is delocalised, hence electron density decreases due to resonance. But in 2 and 3, the lone pair of electron on nitrogen is localised. So, 1 is least basic.

Between 2 and 3, the nitrogen atom is 2 is sp2 hybridised while in 3, it is sp3 hybridised. The lone pair donating tendency of N atom in 2 will thus be less. Hence 3 is the most basic.

Explanation / Answer

49· The decreasing order of basicity of the following is: 2. 3. A 1>2>3 B) 1>3>2 C) 3>2>1 D 2>1>3 E) 3>1>2

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