Formaldehyde can be distinguished from acetaldehyde by:

(a) Fehling's solution                     

(b) Schiff's reagent

(c) Ammonia                               

(d) Ammoniacal ${\mathrm{AgNO}}_3$

Consider the following reaction,

The reaction is fastest when X is-

1. Cl

2. NH₂

3. OC₂H₅

4. OCOR

In a set of reaction propionic acid yielded a compound D.

CH3CH2COOH$\stackrel{{\mathrm{SOCl}}_2}{\to }$ B$\underset{∆}{\overset{N{H}_3}{\to }}$ C$\underset{{\mathrm{Br}}_2}{\overset{\mathrm{KOH}}{\to }}$
$$

The structure of D would be

1. CH₃CH₂NHCH₃

2. CH₃CH₂NH₂

3. CH₃CH₂CH₂NH₂

4. CH₃CH₂CONH₂

$\stackrel{\mathrm{Zn}-\mathrm{Hg}/\mathrm{HCl}}{\to }$Product, Product is

1.  

2.

3.    

4.

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 :