Amides Knowledge-Based Download PDF

Questions

1. 1.

   Which of the following compounds of comparable molecular mass has the highest normal boiling point?

   • A) Propanamide
   • B) Propanoic acid
   • C) 1-Propanol
   • D) Methyl ethanoate
2. 2.

   Which organic product is formed when propanamide is treated with lithium aluminium hydride ($\text{LiAlH}_4$) followed by aqueous workup?

   • A) Propan-1-ol
   • B) Propanoic acid
   • C) Propanal
   • D) Propan-1-amine
3. 3.

   Which of the following pairs of products is obtained from the complete hydrolysis of ethanamide ($\text{CH}_3\text{CONH}_2$) by heating under reflux with aqueous hydrochloric acid?

   • A) Ethanoic acid and ammonia
   • B) Ethanoic acid and ammonium chloride
   • C) Ethanol and ammonium chloride
   • D) Ethylamine and methanoic acid
4. 4.

   Which of the following statements best explains why aliphatic amides are significantly weaker bases than aliphatic amines?

   • A) The nitrogen atom in an amide has an incomplete valence octet that resists protonation.
   • B) The alkyl group attached to the nitrogen atom withdraws electron density through a strong inductive effect.
   • C) The lone pair of electrons on the nitrogen atom is delocalized into the adjacent carbonyl group through resonance.
   • D) The nitrogen atom in an amide is sp-hybridized, holding the lone pair tightly in an orbital with high s-character.
5. 5.

   Which of the following compounds is classified as a secondary ($2^\circ$) amide?

   • A) Ethanamide
   • B) $N,N$-dimethylethanamide
   • C) $N$-methylethanamide
   • D) Benzamide