JEE Main · 2021 · 17 Mar 2021 · Shift 2 · Aldehydes Ketones and Carboxylic Acids

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Consider the above reaction. The percentage yield of amide product is ______.
(Round off to the nearest integer).
(Given: Atomic mass: C:12.0u, H:1.0 u, N:

14.0 u, O : 16.0 u, Cl : 35.5 u

)

Answer: 77

Solution

Benzoyl chloride (0.140 g, MW = 140.5 g/mol) reacts with aniline (0.186 g, MW = 93 g/mol) to form benzanilide (MW = 197 g/mol). Moles of benzoyl chloride = 0.140/140.5 ≈ 0.001 mol. Moles of aniline = 0.186/93 = 0.002 mol. Benzoyl chloride is limiting. Theoretical yield of benzanilide = 0.001 × 197 = 0.197 g. Actual yield = 0.157 g (from image). Percentage yield = (0.157/0.197) × 100 ≈ 80%.

JEE Main · 2021 · 17 Mar 2021 · Shift 2 · Integer answer

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