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Identify the structure where the carbon atom marked with an asterisk is chiral.

1. a) A molecule with a bromine atom attached to the fifth carbon in a straight chain of five carbons.
2. b) A molecule with a bromine atom attached to the fifth carbon in a straight chain of five carbons, but not chiral.
3. c) A molecule with a carboxylic acid group attached to the third carbon in a chain of four carbons.
4. d) A straight chain of five carbons without any additional groups.

Correct answer: a) A molecule with a bromine atom attached to the fifth carbon in a straight chain of five carbons.

Solution

A chiral carbon is a carbon atom bonded to four different groups. Option A satisfies this condition, making it chiral.

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