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Q.

Choose the given statement is true/false:


Isocyanide test can be performed in the fab to identify a primary amine at room temperature. However, teachers always recommend carrying out azo dye test although it requires more time and effort with special conditions like zero degrees centigrade.This test is positive for primary amines. The test is known as isocyanide test because isocyanides are produced when a primary amine is treated with chloroform in presence of alkali.


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a

True

b

False 

answer is A.

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Detailed Solution

The given statement is true.
Concept-The given test is positive for the primary amine. The test is called an isocyanide test as isocyanides are synthesized when a primary amine is treated with chloroform in  presence of akali. The given test is also given by aniline but not by N-ethylaniline.
Question ImageIn aqueous solution, the diazonium salts are unstable at the temperature above Question Image. At temperatures aboveQuestion Image, it decomposes, and is often explosive to liberate nitrogen gas and if we lower the temperature belowQuestion ImageThe salt causes crystallization.
The reaction will continue to go forward at room temperature.
The chemical reaction for coupling reaction:
<math xmlns="http://www.w3.org/1998/Math/MathML"><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><msub><mi mathvariant="normal">C</mi><mn>6</mn></msub><msub><mi mathvariant="normal">H</mi><mn>5</mn></msub><msub><mi>ClN</mi><mrow><mn>2</mn><mo>&#xA0;</mo></mrow></msub><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>+</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><msub><mfenced><msub><mi>CH</mi><mn>3</mn></msub></mfenced><mn>2</mn></msub><mi>NH</mi><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mover><mo>&#x2192;</mo><mrow><mi>dil</mi><mo>.</mo><mi>HCl</mi></mrow></mover><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><msub><mfenced><msub><mi>CH</mi><mn>3</mn></msub></mfenced><mn>2</mn></msub><msub><mi>NC</mi><mn>2</mn></msub><msub><mi mathvariant="normal">H</mi><mn>5</mn></msub><mspace linebreak="newline"/><mi>Benzene</mi><mo>&#xA0;</mo><mi>diazonium</mi><mo>&#xA0;</mo><mi>chloride</mi><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mi mathvariant="normal">N</mi><mo>,</mo><mi mathvariant="normal">N</mi><mo>-</mo><mi>dimethylamine</mi><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mo>&#xA0;</mo><mi mathvariant="normal">N</mi><mo>,</mo><mi mathvariant="normal">N</mi><mo>-</mo><mi>Dimethylethylamine</mi><mspace linebreak="newline"/><mspace linebreak="newline"/></math>Hence, the given statement is true.
 
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