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


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32.

Reaction of PCl3 and PhMgBr would give

  • bromobenzene

  • chlorobenzene

  • triphenylphosphine

  • dichlorobenzene


C.

triphenylphosphine

When phosphorus trichloride reacts with phenyl magnesium bromide (Grignard's reagent), all the three chlorine atoms of PCl3, are replaced by phenyl group of phenyl magnesium bromide and triphenyl phosphine is obtained.

  


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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


38.

Cannizaro reaction is given by

  • HCHO

  • >C(OH)COOH

  • >CHCH2CHO

  • CH3CH2OH


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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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