Subjective Type

Iodoform gives precipitate with silver nitrate on heating but chloroform does not. Explain.

Solution

$$C - I $$ bond is much weaker (bond energy $$234\ kJ\ mol^{-1} $$) than $$C - Cl $$ bond (bond energy $$351\ kJ\ mol^{-1}$$). Therefore, when $$CHI_{3} $$ is heated , $$C - I $$ bond breaks easily to give $$I^{-} $$ ions which react with $$AgNO_{3} $$ solution to gives yellow ppt. of $$AgI $$.

On the other hand when $$CHCl_{3} $$ is heated $$C - Cl $$ bond does not break to give $$Cl^{-} $$ ions and hence ppt. of $$AgCl$$ is not formed.

SIMILAR QUESTIONS

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Which of the following ketones will not respond to iodoform test?

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