CBSE Class 12 Chemistry 2017 Delhi Set 1 Solved Paper

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Question : 10
Total: 26
Write the equations involved in the following reactions:
(i) Wolff-Kishner reduction
(ii) Etard reaction.
Solution:  
(i) Wolff-Kishner reduction method is used to reduce a carbonyl compound like aldehyde or ketone to a hydrocarbon. The reduction reaction takes place when the carbonyl compound is heated with a mixture of hydrazine and a strong base like potassium hydroxide at a temperature range of 453 K to 473 K in ethylene glycol solvent.
(ii) Etard reaction is a reaction in which chromyl chloride oxidises methyl group to a chromium complex which gives benzaldehyde upon hydrolysis.
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