Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

31.

Which of the following is a ketohexose?

  • Glucose

  • Sucrose

  • Sucrose

  • Ribose


32.

Reaction of PCl3 and PhMgBr would give

  • bromobenzene

  • chlorobenzene

  • triphenylphosphine

  • dichlorobenzene


33.

Hydroboration oxidation of 4-methyl octene would give

  • 4-methyl octanol

  • 2-methyl decane

  • 4-methyl heptanol

  • 4-methyl-2-octanone


34.

When ethyl alcohol is heated with conc. H2SO4, the product obtained is

  • CH3COOC2H5

  • C2H2

  • C2H6

  • C2H4


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35.

Anisole is the product obtained from phenol by the reaction known as

  • coupling

  • etherification

  • oxidation

  • esterification


36.

Ethylene glycol gives oxalic acid on oxidation with

  • acidified K2Cr2O7

  • acidified KMnO4

  • alkaline KMnO4

  • periodic acid


37.

A Wittig reaction with an aldehyde gives

  • ketone compound

  • a long chain fatty acid

  • olefin compound

  • epoxide


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38.

Cannizaro reaction is given by

  • HCHO

  • >C(OH)COOH

  • >CHCH2CHO

  • CH3CH2OH


A.

HCHO

Aldehyde, having no α-hydrogen atom, undergo Cannizaro reaction in which two molecules of the aldehyde are involved, one molecule being converted into the corresponding alcohol, and the other into the add. The usual reagent for the Cannizaro reaction is aqueous or ethanolic alkali.

2HCHO + NaOH  HCOONa + CH3OH


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39.

Identify the reactant.

  • H2O

  • HCHO

  • CO

  • CH3CHO


40.

Maleic acid and fumaric acid are

  • position isomers

  • geometric isomers

  • enantiomers

  • functional isomers


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