Question

arrange basicity in decreasing order

Answer 1

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Here's what you were looking for:

The correct answer for this is (2). A>C>B

When an amine group is attached to alkane, alkene, and alkyne, s-character of carbon atom is used to explain the basicity.

In
Alkane: sp3 Hybridisation 25% s character Least Electronegative

Alkene: sp2 Hybridisation 33% s-character

Alkyne: sp Hybridisation 50% s-character Highly Electronegative

So the most Electronegative carbon will attract the lone pair of nitrogen towards itself so it is not available for donation.

So the order should be A>B>C

But
Since the (B) compound is a conjucated system and the lone pair is involved in conjucation and hence least available for donation.

NOTE: Resonance Effect >> Inductive Effect

Therefore the correct answer is (2).

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