CBSE 12th Standard Chemistry Subject Aldehydes , Ketones and Carboxylic Acids HOT Questions Fill Up Questions 2021
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CBSE 12th Standard Chemistry Subject Aldehydes , Ketones and Carboxylic Acids HOT Questions Fill Up Questions 2021
12th Standard CBSE
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Reg.No. :
Chemistry
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Name the aldehyde which does not give Fehling’s soln. test.
(a)Benzaldehyde does not give Fehling soln. test. (Aromatic aldehydes do not give this test).
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What makes acetic acid a stronger acid than phenol?
(a)Greater resonance stabilization of acetate ion over phenoxide ion.
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Why HCOOH does not give HVZ (Hell Volhand Zelinsky) reaction but CH3COOH does?
(a)CH3COOH contains α hydrogens and hence give HVZ reaction but HCOOH does not contain α -hydrogen and hence does not give HVZ reaction.
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Why pcc cannot oxidise methanol to methanoic acid and while KMnO4 can?
(a)This is because pcc is a mild oxidising agent and can oxide methanol to methanal only.While KMnO4 being strong oxidising agent oxidises it to methanoic acid.
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CBSE 12th Standard Chemistry Subject Aldehydes , Ketones and Carboxylic Acids HOT Questions Fill Up Questions 2021 Answer Keys
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Benzaldehyde does not give Fehling soln. test. (Aromatic aldehydes do not give this test).
Benzaldehyde does not give Fehling soln. test. (Aromatic aldehydes do not give this test).
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Greater resonance stabilization of acetate ion over phenoxide ion.
Greater resonance stabilization of acetate ion over phenoxide ion.
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CH3COOH contains α hydrogens and hence give HVZ reaction but HCOOH does not contain α -hydrogen and hence does not give HVZ reaction.
CH3COOH contains α hydrogens and hence give HVZ reaction but HCOOH does not contain α -hydrogen and hence does not give HVZ reaction.
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This is because pcc is a mild oxidising agent and can oxide methanol to methanal only.While KMnO4 being strong oxidising agent oxidises it to methanoic acid.
This is because pcc is a mild oxidising agent and can oxide methanol to methanal only.While KMnO4 being strong oxidising agent oxidises it to methanoic acid.
