Question

In 2-chloro-3,4-dimethylhexane, how many chiral C atoms are present?

• A. 3
• B. 6
• C. 4
• D. 1

Hint:

A chiral carbon must have four different substituents. Look for carbon atoms attached to a variety of groups in a molecule.

Answer 1

The Correct Option is A

The molecule 2-chloro-3,4-dimethylhexane contains three chiral carbon atoms.

• Chiral Carbon Definition: A carbon atom is chiral when it is bonded to four distinct chemical groups. For 2-chloro-3,4-dimethylhexane, the chiral centers are identified as carbon atoms with four unique substituents.
• Analysis of 2-chloro-3,4-dimethylhexane Structure:
  • Carbon 2 is bonded to chlorine (Cl), a methyl group (-CH₃), a -CH₂- group (part of the hexane chain), and the adjacent carbon. This makes it chiral.
  • Carbon 3 is bonded to a -CH₃ group, a -CH₂- group, and a hydrogen atom, classifying it as a chiral center.
  • Carbon 4 is bonded to a methyl group, a -CH₂- group, a hydrogen atom, and a carbon atom from the chain, establishing it as the third chiral center.

Consequently, 2-chloro-3,4-dimethylhexane possesses three chiral carbon atoms.