Which of the following is the least basic?

Arrange the following compounds in the correct order of their basic strength:

Identify the correct decreasing order of the basic strength of the following amines in the aqueous phase: $CH_3NH_2$, $(CH_3)_2NH$, $C_6H_5NH_2$, and $NH_3$.

The possible product$(s)$ obtained from the reaction of cyclobutyl amine with $HNO_{2}$ is/are:

Given below are two statements:
Statement-$I$: In Hofmann degradation reaction,the migration of only an alkyl group takes place from carbonyl carbon of the amide to the nitrogen atom.
Statement-$II$: The group is migrated in Hofmann degradation reaction to an electron-deficient nitrogen atom.
In the light of the above statements,choose the most appropriate answer from the options given below:

Which of the following give Hofmann's degradation reaction?