Question:medium

Which of the following molecule is chiral in nature?

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Chirality rule: Look for a carbon with four different substituents. If any two groups are identical, the molecule is achiral.
Updated On: Mar 2, 2026
  • Propan-2-ol
  • Butan-2-ol
  • 1-Bromobutane
  • 2-Bromopropane
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The Correct Option is B

Solution and Explanation

The question asks about which molecule is chiral in nature. To understand chirality, a molecule is considered chiral if it has a carbon atom bonded to four different substituents, leading to non-superimposable mirror images known as enantiomers.

  1. Propan-2-ol: The structure is CH3-CHOH-CH3. The center carbon (C2) is attached to -OH, -CH3, and -CH3. Here, two substituents are the same (-CH3), so this molecule is not chiral.
  2. Butan-2-ol: The structure is CH3-CH(OH)-CH2-CH3. The center carbon (C2) is bonded to four different groups: -OH, -CH3, -CH2-CH3, and -H. This makes Butan-2-ol chiral.
  3. 1-Bromobutane: The structure is CH3-CH2-CH2-CH2-Br. The bromine atom is only bonded to a terminal carbon with only two hydrogens and one butyl group, leading to achirality.
  4. 2-Bromopropane: The structure is CH3-CHBr-CH3. Here, the brominated carbon has two same substituents (-CH3 groups) suggesting it is achiral.

Therefore, the correct answer is that Butan-2-ol is the molecule that is chiral in nature. This is because it has a carbon atom with four distinct groups attached, satisfying the requirement for chirality.

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