Question

Which of the following compounds has only a primary hydrogen atom?

• A. Butane
• B. Isobutane
• C. Isopentane
• D. Cyclohexane

Answer 1

The correct option is D

Cyclohexane

Explanation for correct option:

(D) Cyclohexane.

• Cyclohexane is a chemical that only contains one primary hydrogen atom.
• A carbon atom is bonded to two other carbon atoms and two hydrogen atoms to form the compound cyclohexane.
• Such a carbon atom is called the primary carbon atom and the hydrogen atom is called the primary hydrogen atom. So, this is the correct option.
  

Explanation for incorrect option:

(A) Butane

• Butane not only contains primary hydrogen but also other hydrogen.
• So, this is an incorrect option.

(B) Isobutane

• Isobutane does not contain primary hydrogen.
• So, this is an incorrect option.

(C) Isopentane

• Isopentane does not contain primary hydrogen.
• So, this is an incorrect option.

Hence, the correct option is (D) Cyclohexane.