Amines

1.4-Nitrotoluene + Br₂: Bromination at the meta position forms 2-Bromo-4-nitrotoluene (Compound P).

2.P + Sn/HCl: Reduction of the nitro group forms 2-Bromo-4-aminotoluene (Compound Q).

3.Q + NaNO₂/HCl: Diazotization forms a diazonium salt.

4.Diazonium salt + H₃PO₄: Forms 2-Bromo-4-hydroxybenzene (Compound R).

5.R + KMnO₄ (alkaline): Oxidation forms 2-Bromo-4-carboxybenzoic acid (final product).

1. CH₃CH₂CH₂I reacts with NaCN → forms CH₃CH₂CH₂CN (Butanenitrile).

2. Partial hydrolysis → converts nitrile to amide → CH₃CH₂CH₂CONH₂ (Butanamide).

3. Hoffmann bromamide degradation with Br₂/NaOH → eliminates one carbon → forms CH₃CH₂CH₂NH₂ (Propylamine).

Hence, the major product is Propylamine.

.Self explanatory

The azo dye test determines whether an organic compound contains a primary aromatic amine or not.In this test, a primary aromatic amine reacts with nitrous acid, which is generated in situ by the reaction of sodium nitrite with hydrochloric acid (HCl), at 0–5°C to produce a diazonium salt. The diazonium salt couples with 2-naphthol (also called beta naphthol) to make a scarlet red dye, which is slightly soluble in water.

Among the given options, only Aniline will show an azo dye test.

.Self explanatory