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Q.
Which method is used to find halogen in organic compound?
Organic Chemistry – Some Basic Principles and Techniques
Solution:
Carius method is used to find halogen in an organic compound. In this method, the weighed amount of organic compound is heated in a sealed tube with fuming $HNO _{3}$ in the presence of $AgNO _{3}$. As a result, halogen present in organic compound is converted into $A g X$ which is weighed. The percentage of halogens can be calculated with the help of direct formula as :
$\%$ of chlorine $=\frac{35.5}{143.5} \times \frac{\text { mass of } AgCl \times 100}{\text { mass of compound }}$
$\%$ of bromine $=\frac{80}{188} \times \frac{\text { mass of } AgBr \times 100}{\text { mass of compound }}$
$\%$ of iodine $=\frac{127}{235} \times \frac{\text { mass of AgI } \times 100}{\text { mass of compound }}$