Question

trimethyl amine is a good lewis base where as trisilyl amine is a very weak base

Answer 1

Tri methyl amine has 3 methyl groups attached to the nitrogen. these - CH3 groups are aliphatic and hence electron donating in nature. They tend to donate electrons to nitrogen which increases the electron density at Nitrogen. Trimethylamine can hence easily donate electrons and hence is a stronger base

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