Pyridine is less basic than triethylamine because

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Pyridine is a cyclic system

In pyridine, lone pair of nitrogen is delocalised

Nitrogen in pyridine is sp² hybridised

Pyridine has aromatic character

answer is B.

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Detailed Solution

In pyridine N is sp² hybridized. Electronegativity of sp²hybridized N-atom is more and lone pair electrons are strongly held by N-atom. These electrons are not readily available for donation. In trimethyl amine due to +I -effect of three CH₃ groups, lone pair electrons are readily available for protonation. (CH₃)₃N is more basic than pyridine.

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