Chemistry-Nucleophilic Addition
NEET Chemistry Nucleophilic Addition MCQ Question
Type: MCQ-numerical-Hard-Class 12
Calculate the theoretical yield of cyanohydrin in grams when 10 grams of acetone (C3H6O) reacts completely with hydrogen cyanide (HCN), assuming HCN is present in excess. (Molar masses: C3H6O = 58 g/mol, HCN = 27 g/mol)
A
12.41 g
B
14.93 g
C
16.55 g
D
13.89 g
Correct Answer
Option B
Detailed Explanation
The reaction of acetone with hydrogen cyanide produces cyanohydrin. Moles of acetone = 10 g / 58 g/mol = 0.172 mol. The same moles of cyanohydrin are formed, with molar mass 85 g/mol (58 + 27). Thus, yield = 0.172 mol × 85 g/mol = 14.93 g.
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