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Which of the following reagent is used to distinguish halogens in an organic compound?

Option: 1

\mathrm{NH _{4} Cl}


Option: 2

\mathrm{HNO _{3}}


Option: 3

\mathrm{FeCl _{3}}


Option: 4

\mathrm{NH _{4} OH}


Answers (1)

best_answer

As we have learnt,

In the detection of Halogens, we acidify a portion of the fusion solution with dilute nitric acid. We, then add an excess of silver nitrate solution. A precipitate indicates the presence of a halogen.

\mathrm{\text { Lassaigne's Solution }+ AgNO _{3} \longrightarrow AgCl (\text { white }) / AgBr (\text { pale yellow }) / Agl (\text { Dark yellow) }}

We decant the mother liquor and treat the precipitate with dilute aqueous ammonia solution. If the precipitate is white and readily soluble in ammonia solution, chlorine is present. In case, it is pale yellow and partially soluble, bromine is present. If it is yellow and insoluble, then iodine and bromine may be confirmed by some more tests.

Hence, the correct answer is Option (4)

Posted by

Divya Prakash Singh

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