JEE Main 2025 Apr 3 Shift 2, Chemistry Q21: Preparation of Alkyl Halides (Halo Alkanes) & Aryl Halides (Halo Arenes)

JEE Main2025Apr 3, Shift 2Chemistry

X g of nitrobenzene on nitration gave 4.2 g of m-dinitrobenzene.

X = ________ g. (nearest integer)

[Given : molar mass (in g mol $^{- 1}$ ) C : 12, H : 1, O : 16, N : 14]

Your answer

Solution

Nitration of nitrobenzene (C $_{6}$ H $_{5}$ NO $_{2}$ , M = 123) installs a second $-$ NO $_{2}$ group meta to the first, giving m-dinitrobenzene (C $_{6}$ H $_{4}$ N $_{2}$ O $_{4}$ , M = 168) in a 1:1 mole ratio.

Moles of m-dinitrobenzene formed $= \frac{4.2}{168} = 0.025$ mol.

Moles of nitrobenzene needed $= 0.025$ mol.

Mass of nitrobenzene $X = 0.025 \times 123 = 3.075$ g.

$∴$ Nearest integer is 3.

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JEE Main 2025 Apr 3 Shift 2, Chemistry Q21: Preparation of Alkyl Halides (Halo Alkanes) & Aryl Halides (Halo Arenes)

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