Curtius and Hofmann Rearrangements

Q.

Intermediates formed during the reaction RCONH₂ with Br₂ and KOH are

1. RCONHBr and RNCO

2. RNHCOBr and RNCO

3. RNH - Br and RNCO

4. RCONBr₂

Q.

Acetamide changes into methylamine by

1. Hofmann bromamide reaction

2. Hofmann reaction

3. Friedel-Craft's reaction

4. Hinsberg reaction

Q. The amines formed when (I) and (II) undergo Hofmann rearrangement are:

1. 
2. 
3. 
4. 

Q. Which of the following reactions is appropriate to convert acetamide to methanamine?

1. Stephen's reaction
2. Gabriel synthesis
3. Carbylamine reaction
4. Hofmann bromamide degradation

Q. Which among the following can be the starting material for the synthesis of benzylamine by Hoffmann-bromamide degradation reaction?

1. $C_6{H}_5{\mathrm{CH}}_2{\mathrm{CONH}}_2$
2. $C_6{H}_5{\mathrm{CH}}_2{\mathrm{NH}}_2$
3. $C_6{H}_5{\mathrm{CONH}}_2$
4. $C_6{H}_5{\mathrm{NHCOCH}}_3$

Q. Which among the following can be the starting material for the synthesis of benzylamine by Hoffmann-bromamide degradation reaction?

1. $C_6{H}_5{\mathrm{CH}}_2{\mathrm{CONH}}_2$
2. $C_6{H}_5{\mathrm{CH}}_2{\mathrm{NH}}_2$
3. $C_6{H}_5{\mathrm{CONH}}_2$
4. $C_6{H}_5{\mathrm{NHCOCH}}_3$

Q. Which of the following is not a usual method for the preparation of primary amines?

1. Curtius method
2. Gabriel phthalimide reaction
3. Hofmann’s method
4. Reductive amination of carbonyls
   

Q. Which of the following reactions are suitable for the preparation of primary amines?

1. Action of ammonia on alkyl halides
2. Hofmann rearrangement
3. Gabriel synthesis
4. Hydrogenation of isocyanides

Q. Hoffmann degradation of 3-bromobenzamide gives:

1. Aniline
2. 3-Bromoaniline
3. Bromobenzene
4. Bromoethyl Benzene