The reagent 'R' in the given sequence of a chemical reaction is : 

The product (A) in the below-mentioned reaction is:

1.		2.
3.		4.

The most stable diazonium salt among the following is: 

1. \(CH_{3}N_{2}^{+}X^{-}\)

2. \(C_{6}H_{5}N_{2}^{+}X^{-}\)

3. \(CH_{3}CH_{2}N_{2}^{+}X^{-}\)

4. \(C_{6}H_{5}CH_{2}N_{2}^{+}X^{-}\)

An organic compound 'A' on treatment with NH₃ gives 'B', which on heating gives 'C'. 'C',
when treated with Br₂ in the presence of KOH produces ethylamine. Compound 'A' is:

1.	CH3CH2COOH
2.	CH3COOH
3.	CH3CH2CH2COOH
4.

Aniline gives a set of the following reactions that yielded a coloured product 'Y':
      

The structure of 'Y' is :

1.
2.
3.
4.