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 Multiple Choice QuestionsMultiple Choice Questions

1.

Which one will not show Cannizzaro reaction ?

  • Trimethyl acetaldehyde

  • Formaldehyde

  • Acetaldehyde

  • Benzaldehyde


2.

The correct statement regarding a carbonyl compound with a hydrogen atom on its alpha -carbon, is

  • a carbonyl compound with a hydrogen atom on its alpha -carbon rapidly equilibrates with its corresponding enol and this process is known as aldehyde-ketone equilibration.

  • a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as carbonylation

  • a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as keto-enol tautomerism

  • a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as keto-enol tautomerism

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3.

Which of the following reagents would distinguish cis-cyclopenta-1-,2-diol from the trans isomer?

  • Ozone

  • MnO2

  • Aluminium isopropoxide

  • Aluminium isopropoxide

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4.

Treatment of cyclopentanone 

methyl lithium gives which of the following species?

  • Cyclopentanonyl anion

  • Cyclopentanonyl cation

  • Cyclopentanonyl radical

  • Cyclopentanonyl biradical

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5.

Given,


Which of the given compounds can exhibit tautomerism?

  • I and II

  • I and III

  • II and III

  • II and III

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6.

An organic compound X having molecular formula C5H10O yields phenyl hydrazone and gives negative response to the iodoform test and tollen test. It produces n -pentane on reduction X could be

  • pentanal

  • 2-pentanone

  • 3-pentanone

  • 3-pentanone


C.

3-pentanone

since the compound X yields phenyl hydrazone and gives a negative response to the iodoform test and tollen 's test. it must contain a C=O group but is neither a methyl ketone nor an aldehyde. having molecular formula C5H10O

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7.

Which one is most reactive towards nucleophilic addition reaction?

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8.

The reaction by which benzaldehyde cannot be prepared? 

  •  +CrO2Cl2 and CS2 followed by H3O+
  •  +H2 in presence of anhydrous AlCl3.
  •  +CO +HCl in presence of anhydrous AlCl3
  •  +CO +HCl in presence of anhydrous AlCl3
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9.

CH3CHO and C6H5CH2CHO can be distinguished chemically by

  • Benedict test

  • Iodoform test

  • Tollen's reagent test

  • Tollen's reagent test

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10.

Predict the products in the given reaction,

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