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  4. In Carius method of estimation of halogen, 0.172 g of an organic compound showed presence of 0.08 g of bromine. Which of these is the correct structure of the compound :

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Q. In Carius method of estimation of halogen, $0.172 g$ of an organic compound showed presence of $0.08 g$ of bromine. Which of these is the correct structure of the compound :

JEE MainJEE Main 2020Organic Chemistry – Some Basic Principles and Techniques

Solution:

In Carius method

mass of organic compound $=0.172 gm$

mass of Bromine $ =0.08 gm $

Hence $\%$ of Bromine $=\frac{0.08}{0.172} \times 100$

$=46.51 \%$

(1) image

$[ \% Br = \frac{80}{172} \times 100] = 46.51 \%$

(2) $CH_3CH_2Br \,\, C_2H_5Br \,\,\% Br = \frac{80}{109} \times 100 = 73.33\%$

image

(4) $CH_3Br$