Question
Write two basic requirements for refining of a metal by Mond process and by Van Arkel Method.
✓
Answer
Two basic requirements of both processes are:
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The metal should form a volatile compound with an available reagent.
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The volatile compound should be easily decomposable, so that the recovery of metal is easy.
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When 3-methylbutan-2-ol is treated with HBr, the following reaction takes place:$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Br}\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\text{CH}_3-\text{CH}-\text{CH}-\text{CH}_3\xrightarrow{\ \ \ \text{HBr} \ \ }\text{CH}_3-\text{C}-\text{CH}_2-\text{CH}_3\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ |\ \ \ \ \ \ \ \ \ \ |\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3\ \ \ \ \text{OH}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3$
Give a mechanism for this reaction.
(Hint: The secondary carbocation formed in step II rearranges to a more stable tertiary carbocation by a hydride ion shift from 3rd carbon atom.)
→Give a mechanism for this reaction.
(Hint: The secondary carbocation formed in step II rearranges to a more stable tertiary carbocation by a hydride ion shift from 3rd carbon atom.)
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(i) $CH _3- CH _2- Cl \xrightarrow{+ A } B \xrightarrow{ C } CH _3- CH _2- NH _2+ HCOOH$
(ii) $CH _3- I \xrightarrow{+ A } B \xrightarrow{ C } CH _3- NH - CH _3$
→(i) $CH _3- CH _2- Cl \xrightarrow{+ A } B \xrightarrow{ C } CH _3- CH _2- NH _2+ HCOOH$
(ii) $CH _3- I \xrightarrow{+ A } B \xrightarrow{ C } CH _3- NH - CH _3$
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→Assertion: $\ce{HNO_3}$ makes iron passive.
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