Match each nitrogen-containing organic compound on the left with its correct structural cl… — JAMB UTME

Match each nitrogen-containing organic compound on the left with its correct structural classification on the right.

Methylamine ( $CH_3NH_2$ )Primary aliphatic amine
Ethanamide ( $CH_3CONH_2$ )Neutral organic amide
Phenylamine ( $C_6H_5NH_2$ )Primary aromatic amine
Dimethylamine ( $(CH_3)_2NH$ )Secondary aliphatic amine

Answer

Methylamine pairs with Primary aliphatic amine; Ethanamide pairs with Neutral organic amide; Phenylamine pairs with Primary aromatic amine; Dimethylamine pairs with Secondary aliphatic amine.

Each compound matches its unique chemical definition: Methylamine is a

1^\circ

aliphatic amine, Ethanamide is a neutral amide, Phenylamine is a

1^\circ

aromatic amine, and Dimethylamine is a

2^\circ

aliphatic amine.

Step-by-Step Solution

Examine the functional groups and substituents attached to nitrogen in each compound.

Methylamine (

CH_3NH_2

) and Phenylamine (

C_6H_5NH_2

) each have one organic group attached (

1^\circ

). Dimethylamine (

(CH_3)_2NH

) has two organic groups attached (

2^\circ

). Ethanamide (

CH_3CONH_2

) has a carbonyl group (

C=O

) linked directly to nitrogen.

The number of alkyl/aryl groups determines amine degree (

1^\circ, 2^\circ, 3^\circ

), while a carbonyl-nitrogen bond defines an amide.

Classify by aliphatic, aromatic, or neutral amide characteristics.

Methylamine contains an alkyl group (

1^\circ

aliphatic amine). Phenylamine contains a benzene ring (

1^\circ

aromatic amine). Dimethylamine has two alkyl groups (

2^\circ

aliphatic amine). Ethanamide is an amide and exhibits neutral aqueous behavior due to lone pair resonance delocalization.

Structure and electronic delocalization determine both classification and relative basicity.

Key Concept

Classification of amines (primary, secondary, aromatic, aliphatic) and amides.

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