JEE Main · 2026 · 22 Jan 2026 · Shift 2 · Some Basic Concepts of Chemistry

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The mass of benzanilide obtained from the benzoylation reaction of 5.8 g of aniline, if yield of product is 82%, is _____ g (nearest integer).
(Given molar mass in

g mol^{- 1}

H: 1, C: 12, N: 14, O: 16)

Answer: 10

Solution

Benzoylation of aniline (

C_{6} H_{5} N H_{2}

M = 93 g mo l^{- 1}

) gives benzanilide (

C_{6} H_{5} CONH C_{6} H_{5}

M = 197 g mo l^{- 1}

) in a

1 : 1

mole ratio. The aniline taken is

\frac{5.8}{93} = 0.0624

mol, so at

82%

yield the benzanilide formed is

0.0624 \times 0.82 = 0.0512

mol. Its mass is

0.0512 \times 197 = 10.1 g

. The mass of benzanilide obtained is

10 g

JEE Main · 2026 · 22 Jan 2026 · Shift 2 · Integer answer

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