Acetaldehyde gives orange coloured precipitate on treatment with:

1. 2, 4-DNP

2. ${\mathrm{NH}}_2\mathrm{OH}$

3. ${\mathrm{NaHSO}}_3$

4. NaOH

Which of the following reagents converts ${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{COCHO}$ to ${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{C}\left(\mathrm{OH}\right)\mathrm{COOH}$?

1. aq. NaOH

2. Acidic ${\mathrm{Na}}_2{\mathrm{SO}}_4$

3. ${\mathrm{Na}}_2{\mathrm{CrO}}_4/{\mathrm{H}}_2{\mathrm{SO}}_4$

4. ${\mathrm{NaNO}}_3/\mathrm{HCl}$

When benzene sulphonic acid and p-nitrophenol are treated with ${\mathrm{NaHCO}}_3$, the gases released respectively are:

1. ${\mathrm{SO}}_2, {\mathrm{NO}}_2$

2. ${\mathrm{SO}}_2, \mathrm{NO}$

3. ${\mathrm{SO}}_2, {\mathrm{CO}}_2$

4. ${\mathrm{CO}}_2, {\mathrm{CO}}_2$

Which reagent is used to convert benzoic acid into benzoyl chloride?

1. Cl₂, hv

2. SO₂

3. SOCl₂

4. Cl₂, H₂O

Schiff's reagent gives pink color with

1. Acetone

2. Acetaldehyde

3. Acetic acid

4. Methyl acetate

The hydrogenation of benzoyl chloride in the presence of Pd and BaSO₄ gives:

1. Benzyl alcohol

2. Benzaldehyde

3. Benzoic acid

4. Phenol

The reagent that can be used to distinguish between methanoic acid and ethanoic acid is: 

1. Sodium carbonate solution

2. Ammonical silver nitrate solution

3. Phenolphthalein

4. Neutral ferric chloride solution

X + CH₃COOH   →   Ester  +  H₂O  
X is:

Lactic acid on oxidation with alkaline potassium permanganate gives:

1. Propionic acid

2. Cinnamic acid

3. Pyruvic acid

4. Tartaric acid