The increasing basicity order of the following compounds is:

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In case of polar protic solvents, two factors decide the basic character. The positive inductive effect from alkyl groups which increases basicity.

$3^{o} > 2^{o} > 1^{o}$ Amine

& the Steric Hindrance. $1^{o} > 2^{} > 3^{o}$

Thus, the resultant basic character is determined by taking the above two factors into account.

So order will be $2^{o} > 1^{o} > 3^{o}$ if methyl group is present as alkyl group otherwise order will be $2 ° > 3 ° > 1 °$ .

In aromatic & Aliphatic: Aliphatic Amine are more basic than aromatic because the lone pair of $N$ is involved in delocalization.

So basic character is in the order $2^{o} > 1^{o} > 3^{o} > A r o m a t i c A m i n e$

So (B) > (A) > (C) > (D)

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