Question

The IUPAC name of CH$_3$-CH-CH$_3$-CH$_2$Cl is

• A. 3-chloro-2-methyl butane
• B. 2-chloro-3-methyl butane
• C. 3-methyl-2-chlorobutane
• D. 2-chloro-3-methylbutane

Hint:

When naming alkanes with substituents, number the chain starting from the end closest to the first substituent.

Answer 1

The Correct Option is B

Step 1: Understand the structure of the compound.
The given structure is CH$_3$-CH-CH$_3$-CH$_2$Cl. This structure represents a butane chain with a chlorine atom (Cl) and a methyl group (CH$_3$) attached to it.
Step 2: Identify the functional groups and their positions.
- The chlorine atom is attached to the second carbon in the chain (2-chloro). - The methyl group is attached to the third carbon in the chain (3-methyl). Thus, the IUPAC name is "2-chloro-3-methyl butane".
Step 3: Apply to the options.
The correct IUPAC name is (B) 2-chloro-3-methyl butane.
Final Answer: \[ \boxed{\text{2-chloro-3-methyl butane}} \]