Question

Benzoic acid dissolved in benzene shows a molecular weight of:

• A. 61
• B. 244
• C. 366
• D. 122

Answer 1

Answer: (B)

Benzoic acid dimerises in benzene.
Mol. wt. of benzoic acid $=78+12+32=122$
Hence, molecular weight of benzoic acid in benzene is
$=122+122=244$