Positive Fehling test is shown by from Chemistry Aldehydes, Keto

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 Multiple Choice QuestionsMultiple Choice Questions

711.

The reaction CH3CH2ONa + BrCH2CH3 -NaBr CH3CH2OCH2CH3 is called

  • Frankland reaction

  • Wurtz reaction

  • Williamson's synthesis

  • Cannizaro's reaction


712.

Schiff's reagent is

  • p-rosaniline hydrochloride solution decolourised with sulphurous acid

  • magenta solution decolourised with Cl2

  • ammoniacal silver nitrate solution

  • alkaline KMnO4 solution


713.

Reduction of acetyl chloride with H2 in presence of Pd gives

  • CH3COCH3

  • C2H5OH

  • CH3COOH

  • CH3CHO


714.

In which of the following compounds carboxylic group (-COOH) is not present?

  • Acetic acid

  • Lactic acid

  • Benzoic acid

  • Picric acid


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715.

When calcium acetate mixed with calcium formate is distilled, which of the following is not obtained?

  • Acetone

  • Formaldehyde

  • Acetaldehyde

  • Propionaldehyde


716.

Glucose response to silver mirror test due to the presence of

  • -COOH group

  • an alkaline group

  • a ketonic group

  • an aldehydic group


717.

The reaction of benzaldehyde with alkali gives

  • phenol+ sodium benzoate

  • benzene + benzyl alcohol

  • benzyl alcohol + sodium benzoate

  • phenol+ benzene


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718.

Positive Fehling test is shown by

  • acetaldehyde

  • acetone

  • benzaldehyde

  • acetophenone


A.

acetaldehyde

When aliphatic aldehyde is heated with Fehling's solution, to give a red precipitate of cuprous oxide.

CH3-CO-H + 2Cu2+ + 5OH- → CH3-COO- + Cu2O + 3H2O


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719.

Reduction of an aldehyde gives

  • primary alcohol

  • monocarboxylic acid

  • secondary alcohol

  • tertiary alcohol


720.

Which of the following is strongest base?

  • Perkin's reaction

  • Knoevenagel reaction

  • Reformatsky reaction

  • Benzoin condensation


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