Which of the following substances produce acetaldehyde on dry distillation?
Correct answer: C. both (a) and (b)
- A. (CH3COO)2 Ca
- B. (HCOO)2Ca
- C. both (a) and (b)
- D. none
Explanation
(a) (CH3COO)2Ca (Calcium Acetate): When heated, calcium acetate breaks down into several products, including acetone (CH3COCH3), calcium carbonate (CaCO3), and a small amount of acetaldehyde. The main reaction can be represented as:(CH3COO)2Ca (heat) → CH3COCH3 + CaCO3 + CH3CHOSo, while not the primary product, acetaldehyde is indeed formed.(b) (HCOO)2Ca (Calcium Formate): Similarly, calcium formate decomposes with heat, mainly producing calcium carbonate and carbon monoxide (CO). However, like option (a), it also generates a small amount of acetaldehyde:(HCOO)2Ca (heat) → CaCO3 + CO + CH3CHOTherefore, both options (a) and (b) fulfil the requirement of producing acetaldehyde, even if not as their primary products. So option c is correct
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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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