JEE Main 2022 · 29 Jul · Shift 1 · Chemistry Q89

← JEE Main 2022 · 29 Jul · Shift 1

ChemistryInteger+4 / -1Question 89 of 90

In bromination of Propyne, with Bromine 1, 1, 2, 2-tetrabromopropane is obtained in 27% yield. The amount of 1, 1, 2, 2-tetrabromopropane obtained from 1 g of Bromine in this reaction is _______ $\times10^{-1}$ g. (Nearest integer)

(Molar Mass : Bromine = 80 g/mol)

Your answer

Answer and worked solution

Official answer: 3

Stoichiometry. $\mathrm{C_3H_4+2Br_2\to C_3H_4Br_4}$ (M = 360). 1 g of Br₂ is $\frac1{160}$ mol, giving $\frac1{320}$ mol, i.e. 1.125 g at full yield.

At 27%: 0.30 g $=3\times10^{-1}$ g.

Answer: 3

Topics:Alkynes Stoichiometry

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JEE Main 2022 · 29 Jul · Shift 1, Chemistry question 89