Which of the following is the most basic compound?

Which of the following compounds reacts with acetone to form a product containing the $>C = N -$ group?

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: Aniline on nitration yields ortho,meta and para nitro derivatives of aniline.
Reason $R$: Nitrating mixture is a strong acidic mixture.
In the light of the above statements,choose the correct answer from the options given below.

The major product formed in carbylamine reaction is

Identify the $CORRECT$ decreasing order of basic strength of compounds from the following.

Which of the following statements is $NOT$ correct regarding Hofmann's exhaustive alkylation?