Question

Compound A (molecular formula $C_5{H}_{10}$) gives only one monochlorinated product. Write the structure of compound A.

• A. 2-pentene
• B. 1-methyl cyclobutane
• C. cyclopentane
• D. 1-pentene

Answer 1

Answer: (C)

$Cyclopentane\stackrel{C{l}_2+hv}{\to }Cyclopentylchloride$

Compound A has molecular formula $C_5{H}_{10}$.

The degree of unsaturation is 1. It should have either one double bond or should be a cyclic compound. If it has one double bond, then it will give many monochlorinated products.

However, it gives only one monochlorinated product. So, it is a cyclic compound. Thus, it should be cyclopentane.

Option D is correct.