The correct answer is Option C.

As the number of alkyl group increases, due to +I effect the basicity of amines increases.

The carbylamine reaction, also known as Hoffman's isocyanide test is a chemical test for detection of primary amines. In this reaction, the analyte is heated with alcoholic potassium hydroxide and chloroform. If a primary amine is present, the isocyanide (carbylamine) is formed which are foul smelling substances.

The correct answer is Option D.
Only primary amines liberate nitrogen gas on reaction with HNO2.

The Correct answer is option B
Hoffman bromamide degradation reaction is shown by ArCONH₂​.
Where the aryl amide is converted to aryl amine in the presence of Br₂​ and NaOH

The correct answer is Option B.


Aniline : 

The correct answer is Option B.
Amines are basic in nature because the nitrogen atom in amines possesses a lone pair that can be donated.

According to the Lewis acid-base concept, amines can donate an electron pair, so they are Lewis bases.

Also, Brønsted-Lowry bases can accept a proton to form substituted ammonium ions.
So, amines are bases according to both the Lewis and the Brønsted-Lowry theories.

The correct answer is Option D.

Because C₄H₉NH₂ is primary amine and can form hydrogen bonding more than secondary amine (C₂H₅)₂NH and tertiary amine C₂H₅N(CH₃)₂ . More hydrogen bonding  leads to strong bonding between the molecules, hence increases the boiling point.