Cannizaro reaction is not given by : from Chemistry Aldehydes, K

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 Multiple Choice QuestionsMultiple Choice Questions

1011.


1012.

Which of the following reaction will not produce ethylene glycol?

  • ClCH2CH2Cl heatOH-

  • HO-CH2-CH2-OCH3 heatOH-

  • CH= CH2 KMnO4alkaline


1013.

Assertion : Mixture of benzaldehyde and acetaldehyde in hot allkaline medium gives cinnamaldehyde.

Reason : Benzaldehyde is strong electrophile than acetaldehyde.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


1014.

An aromatic compound C7H6Cl(A), gives AgCl on boiling with alcoholic AgNO2 solution and yields C,HOCI on treatment with sodium hydroxide. (A) on oxidation gives monochlorobenzoic acid. The compound (A) is:


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1015.

Formic acid can be distinguished from acetic acid by its reaction with :

  • NaHCO3

  • Tollen's reagent

  • NaOH

  • None of these


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1016.

Cannizaro reaction is not given by :

  • acetaldehyde

  • formaldehyde

  • benzaldehyde

  • triethyl acetaldehyde


B.

formaldehyde

Aldehydes containing no α - H atom , on reaction with 50% NaOH or KOH , undergo disproportionation reaction to give an alcohol and sodium or potassium salt of acid .This eaction is called Cannizaro reaction . CH3CHO does not give Cannizaro reaction due to the presence of α - H atoms.


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1017.

In the Rosenmund's reaction

RCOCl + H2 Pd/BaSO4 RCHO + HCl

here BaSO4

  • promotes catalytic activity of Pd

  • removes the HCl formed in the reaction

  • deactivates Pd

  • activates Pd


1018.

The product P is

  • None of these.


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1019.

Two molecules of acetone in presence of dil. NaOH give the product :

  • 4 - methyl - 2 - pentanone

  • 4 - hydroxy - 2 - pentanal

  • 3 - hydroxy isopropyl propanone

  • 4 - hydroxy - 4 - methyl - 2 - pentanone


1020.

d(+) lactic acid is obtained from :

  • fermentation of cane sugar

  • green vegetables

  • muscles

  • fermentation of milk sugar


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