What amount of bromine will be required to convert 2 g of phenol into 2, 4, 6-tribromophenol? (Given molar mass in gmol^-1 of C,H,O,Br are 12,1,16,80 respectively)

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4.0 g

6.0 g

10.22 g

20.44 g

answer is A.

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Detailed Solution

$\begin{array}{l} Moles of phenol = \frac{2}{94} = 0.021 \\ ∴ Moles of bromine = 0.021 \times 3 = 0.064 \\ ∴ Mass of bromine = 0.064 \times 160 = 10.22 g \end{array}$

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