Question

Among the isomers of $C_6{H}_{1}4$ , which will give maximum number of mono-chloro-derivatives ?

• A. 2, 3-dimethyl butane
• B. 2-methylpentane
• C. 3-methylpentane
• D. Hexane

Answer 1

The correct option is B 2-methylpentane

Monochloro derivatives means the different types of ismoers formed after addition of chlorine atom.

For hexane, there is symetry of the structure at 3-4 bond so chloride can attach to first, second and third to give "3" monochloro derivatives.

2-methyl pentane, chloride can attach to any of the 5 root chain carbons to give "5" different monochloro derivatives.

2,3-dimethyl butane, there is symetry around 2-3 bond so chloride can attach to first and second carbon to give two different structure.

$\Rightarrow$ Answer is 2-methyl pentane.