NEET Chemistry Nucleophilic Addition MCQ Question
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)
12.41 g
14.93 g
16.55 g
13.89 g
Correct Answer
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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