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Benzamide and benzylamine can be distinguished by

Solution

Cold dil.NaOH does not attack to either of the compound,while cold dil.HCl reacts only with benzyl amine C₆H₅CH₂NH₂

\(CH_{3} – CH_{2}C \equiv N \overset{X}{\rightarrow} CH_{3}CH_{2}CHO\) The compound X is

n-Propylamine yields a volatile compound X on warming with alc. alkali and chloroform. X has an offensive odour.The structure of X is

Nitrobenzene on treatment with zinc dust and aqueous ammonium chloride gives:

Hydrolysis of phenyl isocyanide forms

When primary amine is heated with CS₂ in presence of excess mercuric chloride, it gives isothiocyanate. This reaction is called

Solution

N-alkyl formamides when dehydrated with POCl₃ inpresence of pyridine give isocyanides

Aromatic nitriles (ArCN) are not prepared by reaction :

Solution

Aryl halide (ArX) does not undergo nucleophilic substitution because they have strong C—X bond due to resonance.

In the reaction:
\(R – C = N \overset{x}{\rightarrow} RCH_{2}NH_{2}\) X can be :

Methyl cyanide is less basic than methylamine because:

there is a triple bond between carbon and nitrogen atoms
molecular weight is higher than methylamine
the lone pair of electrons in nitriles belongs to sp-orbital and lone pair of electrons in amines belongs to sp³-orbital
None of these

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