Question

A sample of organic compounds is found to have an optical rotation of $+{20}^o$. Which of the following statement(s) is/are correct about the sample?

• A. The sample might be a mixture of d-isomers
• B. All compounds in the sample must be containing chiral carbon
• C. The sample might be mixture of d and l isomers in unequal amounts
• D. The compound(s) in the sample must be chiral

Answer 1

Answer: (A), (C), (D)

The correct options are
A The sample might be a mixture of d-isomers
C The sample might be mixture of d and l isomers in unequal amounts
D The compound(s) in the sample must be chiral

As sample has net rotation so it can be pure d compound or a mixture of d compounds or can be mixture of d and l isomers in unequal amounts.