JEE Main · 2026 · 24 Jan 2026 · Shift 2 · Some Basic Concepts of Chemistry

WhatsApp Email

A student has planned to prepare acetanilide from aniline using acetic anhydride. The student has started from 9.3 g of aniline. However, the student has managed to obtain 11 g of dry acetanilide.
The % yield of this reaction is :-

(A) $81.5%$ ✓ Correct
(B) $97.5%$
(C) $59.5%$
(D) $72.5%$

Answer: (A)

Solution

Aniline reacts with acetic anhydride to give acetanilide,

C_{6} H_{5} N H_{2} + (C H_{3} C O)_{2} O \to C_{6} H_{5} N H C O C H_{3} + C H_{3} C O O H

, in a

1 : 1

mole ratio. Moles of aniline

= \frac{9.3}{93} = 0.1

. The theoretical mass of acetanilide (molar mass

135

) is

0.1 \times 135 = 13.5 g

. With

11 g

obtained, the percentage yield is

\frac{11}{13.5} \times 100 = 81.5%

JEE Main · 2026 · 24 Jan 2026 · Shift 2 · Single correct option

Practise more: all JEE Main PYQs on Some Basic Concepts of Chemistry →

More JEE Main questions on Some Basic Concepts of Chemistry

80 mL of a hydrocarbon on mixing with 264 mL of oxygen in a closed U-tube undergoes complete combustion. The residual gases after cooling to 273 K occupy 224 mL. When the system is treated with KOH solution, the volume decreases to 64 mL. The formula of the hydrocarbon is:
JEE Main 2026View solution →
14.0 g of calcium metal is allowed to react with excess HCl at 1.0 atm pressure and 273 K.
Which of the following statements is incorrect?
[Given: Molar mass in $g mol^{- 1}$ of $Ca - 40, Cl - 35.5, H - 1$ ]
JEE Main 2026View solution →
In the reaction,
$2 Al (s) + 6 HCl (aq) \to 2 Al^{3 +} (aq) + 6 Cl^{-} (aq) + 3 H_{2} (g)$
JEE Main 2026View solution →
By usual analysis, 1.00 g of compound (X) gave 1.79 g of magnesium pyrophosphate. The percentage of phosphorus in compound (X) is: (nearest integer)
(Given, molar mass in $g mol^{- 1}$ : O=16, Mg=24, P=31)
JEE Main 2026View solution →
At $T (K), 100 g$ of $98% H_{2} SO_{4} (w / w)$ aqueous solution is mixed with 100 g of $49% H_{2} SO_{4} (w / w)$ aqueous solution. What is the mole fraction of …
JEE Main 2026View solution →
$A + 2 B ⟶ AB_{2}$

36.0 g of 'A' (Molar mass : $60 g mol^{- 1}$ ) and 56.0 g of ' B ' (Molar mass : $80 g mol^{- 1}$ ) are allowed to react. Which of the following statements are correct?
(A) ' A …
JEE Main 2026View solution →