Acetaldehyde reacts with semicarbazide to yield the following as a product:

1.	\( {CH_3CH=NHNH_2} ~\)
2.	\({CH_3CH=NCONHNH_2}~~~\)
3.	\({CH_3CH=NNH-CO-NH_2}~~~~~\)
4.

Cyanohydrin of which of the following compounds on hydrolysis gives an optically active product:

1. HCHO

2. ${\mathrm{CH}}_3\mathrm{CHO}$

3. ${\mathrm{CH}}_3{\mathrm{COCH}}_3$

4. All of the above

RCHO and NH₂NH₂ react with each other in an acidic medium. The product obtained is:

1. RCON₃

2. RCH=NH

3. RCH₂NH₂

4. RCH=NNH₂

The product P is:

1.		2.
3.		4.

A and B in the following reactions are:

1.
2.
3.
4.

Which one among the given options, can be oxidized to produce a carbonyl compound?

1. o-Nitrophenol

2. Aniline

3. 2-Methyl-2-hydroxypropane

4. 2-Hydroxy propane