Which of the following cannot be written in an isomeric form ?

Options

A. `CH_(3)-CH(OH)-CH_(2)-CH_(3)`
B. `CH_(3)-CHO`
C. `CH_(2)=CH-Cl`
D. `Cl-CH_(2)CH_(2)-Cl`

Answer

C

Explanation

(A) `CH_(3)-overset(OH)overset(|)underset(H)underset(|)(C)-CH_(2)-CH_(3)` exist in isomeric form
(B) `CH_(3)-overset(O)overset(||)(C)-H hArr CH_(2)=overset(OH)overset(|)(CH)` exist in tautomeric form.
(C)
(D) `underset(Cl)underset(|)(CH_(2))-underset(Cl)underset(|)(CH_(2)) to` exist in conformational form.