Only two isomeric monochloro derivatives are possible for

Options

A. n-butane
B. 2, 4-dimethyl pentane
C. Benzene
D. 2-methyl propane

Answer

A, D

Explanation

n-butane has following two isomeric monochloro derivatives
`underset("1-chloro butane")(CH_(3)-CH_(2)-CH_(2)-CH_(2)Cl)` and `underset("2-chloro butane")(CH_(3)-CH_(2)-underset(Cl)underset(|)(CH)-CH_(3))`
2-methyl propane has following two isomeric monochloro derivatives
`{:(" "CH_(3)),(" |"),(underset("2-methyl, 1-chloro-butane")(CH_(3)-CH-CH_(2)Cl)):}` and `{:(" "CH_(3)),(" |"),(CH_(3)-C-CH_(3)),(" |"),(" "Cl),("2-methyl-2-chloropropane"):}`