Question

Compound A with molecular formula $C_5{H}_{10}$ gives one monochlorination product. Compound A is :

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

Answer 1

The correct option is D cyclopentane

$1-pentene-C{H}_2=CHC{H}_{2}C{H}_{2}C{H}_3$

$2-pentene-C{H}_{2}CH=CHC{H}_{2}C{H}_3$

${\left(C{H}_3\right)}_{2}C=CHC{H}_3$ is 2-methyl but-2-ene.

All these contain primary and secondary hydrogen atoms and gives at least 2 monochlorination products.

Only cyclopentane gives 1 monochlorination product as only secondary hydrogen atoms are present and only one type of hydrogen can be replaced.

Option D is correct.