Question

The IUPAC name of \( \text{CH}_3\text{CH}_2\text{CH}_2\text{Cl} \) is

• A. 1-chloro-2-methyl butane
• B. 1-chloroisopentane
• C. 1-chloro-3-methyl butane
• D. None of these

Hint:

When naming organic compounds, always identify the longest carbon chain, number it from the end nearest to the substituent, and name based on IUPAC rules.

Answer 1

The Correct Option is C

Step 1: Identifying the structure.
The compound \( \text{CH}_3\text{CH}_2\text{CH}_2\text{Cl} \) is a simple alkane with a chlorine atom attached to the first carbon in a butane chain. The correct name involves identifying the position of the chlorine and the methyl group. Step 2: Analysis of options.
(A) 1-chloro-2-methyl butane: This is incorrect because the methyl group is attached to the third carbon, not the second.
(B) 1-chloroisopentane: This is incorrect because the compound is not isopentane; it has a linear chain.
(C) 1-chloro-3-methyl butane: Correct — This is the correct IUPAC name as the chlorine is at position 1, and the methyl group is at position 3.
(D) None of these: This is incorrect since (C) is the correct name.
Step 3: Conclusion.
The correct answer is (C) because the chlorine is at position 1, and the methyl group is at position 3 in the butane chain.