Which of the following aldehydes shows rapid reaction with sodium nitroprusside
Correct answer: A. formaldehyde
- A. formaldehyde
- B. benzaldehyde
- C. acetaldehyde
- D. acetone
Explanation
Formaldehyde, the smallest and most reactive aldehyde, readily shakes hands with sodium nitroprusside in a swift and vibrant reaction. This quick dance yields a deep red colored complex almost instantly, revealing formaldehyde's presence without delay.CH₂O + Na₂[Fe(CN)₅NO] + 2NaOH → Na₄[Fe(CN)₅C=NOH] + H₂O (deep purple complex)
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About Aldehydes and Ketones
Aldehydes and ketones contain the polar carbonyl group, but aldehydes are generally more readily oxidised and more reactive than ketones. Coverage includes preparation by oxidation or reduction routes, nucleophilic addition of reagents such as hydrogen cyanide and bisulfite, and tests that distinguish aldehydes from ketones.
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