Which of the following  gives aldol condensation

(1)

(2)

(3)

(4)

 R-Cl       $\underset{\mathrm{Dry} \mathrm{Ether}}{\overset{Mg}{\to }}$ A $\underset{\mathrm{ii}·{\mathrm{H}}_3{\mathrm{O}}^{+}}{\overset{\mathrm{i}·{\mathrm{CO}}_2}{\to }}$

R-Cl is

(1)

(2)

(3)

(4)

The final product 'B' in the below mentioned reaction is:

1.		2.
3.		4.

$\underset{∆}{\overset{{\mathrm{P}}_2{\mathrm{O}}_5}{\to }}$Product

The product is-

1.

2.

3.

4.

Identify the product (C) in the series of reactions

CH₃CN$\stackrel{\mathrm{Na}/{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}}{\to }$A$\stackrel{{\mathrm{HNO}}_2}{\to }$B$\stackrel{{\mathrm{KMnO}}_4,{\mathrm{H}}^{+}}{\to }$C

1. CH₃COOH

2. CH₃CH₂NHOH

3. CH₃CONH₂

4. CH₃CHO

Product (B) of the reaction is :

Product (A) of the reaction is :

(A) and (B) is differentiated by :

(a) NaH

(b) 2-4 DNA

(c) Tollen's reagent 

(d) ${\mathrm{NaHSO}}_3$