1.  optical isomerism

2.  geometrical isomerism

4.  none of these

2.  RCONH2, RCOOH, NH4OH

3.  RCONHOH, RCOOH, NH3

4.  RCOONH4, RCONH2, RCOOH

2.  Amides

3.  Pseudo-nitroles

4.  Nitro alcohols

2.  9σ, 9π

3.  3σ, 4π

4.  5σ, 7π

2.  m-toluidine

3.  p-toluidine

4.  p-chloroaniline

2.  (CH3)2NH

3.  (CH3)3N

4.  (C6H5)2NH

1.  HCN

3.  KCN

4.  AgNO2 followed by reduction

1.  Acetyl chloride

2.  Ammonia

3.  Acetone

1.  

2.  

4.  

1.  Reaction with HONO

3.  Reaction with acetyl chloride

4.  Reaction with Grignard reagent