Assertion :When an aldehyde is heated with $A g N O_{3}$ and $N H_{4} O H$ , a shining layer is formed on the inner walls of the test tube. Reason: Aldehyde gets reduced to alcohol in this reaction.

Both Assertion and Reason are correct and the Reason is the correct explanation of the Assertion

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Both Assertion and Reason are correct but the Reason is not the correct explanation of the Assertion

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The Assertion is correct but the Reason is incorrect

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The Assertion is incorrect but the Reason is correct

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Solution

The correct option is C The Assertion is correct but the Reason is incorrect
$A g N O_{3}$ and $N H_{4} O H$ contains the diamminesilver(I) ion ; $[A g (N H_{3})_{2}]^{+}$ . On adding the aldehyde to this freshly prepared solution, a grey precipitate of silver or silver mirror is formed.

The reaction can be shown as:
$2 [A g (N H_{3})_{2}]^{+} + R C H O + O H^{-} \to 2 A g + R C O O^{-} + 4 N H_{3} + 2 H_{2} O$

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Assertion :When an aldehyde is heated with AgNO3 and NH4OH, a shining layer is formed on the inner walls of the test tube. Reason: Aldehyde gets reduced to alcohol in this reaction.

Assertion :When an aldehyde is heated with $A g N O_{3}$ and $N H_{4} O H$ , a shining layer is formed on the inner walls of the test tube. Reason: Aldehyde gets reduced to alcohol in this reaction.