Question

IUPAC names of the following compounds A and B are:

• A. A = But-3-en-2-amine, B = 4-N, N-dimethylaminochlorobenzene
• B. A = But-1-en-3-amine, B = 4-N, N-dimethylaminochlorobenzene
• C. A = But-1-en-3-amine, B = 4-Chloro-N, N-dimethylbenzenamine
• D. A = But-1-en-3-amine, B = 4-Chloro-N, N-dimethylbenzenamine

Hint:

For naming amines, prioritize the longest chain with the double bond and place -amine as a suffix with the correct numbering. For aromatic compounds, follow substituent priority.

Answer 1

The Correct Option is D

Step 1: Naming Compound A (Amine)
- The longest chain has 4 carbons → Butene.
- The double bond starts at C-1 → But-1-ene.
- The amine (-NH\(_2\)) is at C-3 → But-1-en-3-amine. Step 2: Naming Compound B (Aromatic Amine)
- The benzene ring has a chloro (-Cl) group at C-4.
- The dimethylamine (-N(CH\(_3\))\(_2\)) is at C-1.
- Correct IUPAC name → 4-Chloro-N, N-dimethylbenzenamine.
Thus, the correct answer is \( \text{But-1-en-3-amine}, \text{4-Chloro-N, N-dimethylbenzenamine} \). \bigskip

Answer 2

The IUPAC names of the compounds shown are:

Compound A:
The structure has a 4-carbon chain with a double bond starting at carbon 1 and an amino group at carbon 3.
Therefore, the name is:
\[ \boxed{\text{But-1-en-3-amine}} \]

Compound B:
The structure is a benzene ring with a chlorine substituent at position 4 and a dimethylamino group (\( \text{N(CH}_3)_2 \)) attached.
Therefore, the name is:
\[ \boxed{\text{4-Chloro-N,N-dimethylbenzenamine}} \]

Hence,
\[ \text{A = But-1-en-3-amine}, \quad \text{B = 4-Chloro-N,N-dimethylbenzenamine} \]