Which of the following reacts with phenol to give salicylaldehyde

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 Multiple Choice QuestionsMultiple Choice Questions

701.

Dehydration of glycerol gives

  • propane

  • propene

  • acrolein

  • benzene


702.

The acid present in vinegar is

  • CH3COOH

  • H2SO4

  • HCl

  • HNO3


703.

Which one of the following reagents can distinguish between an aldehyde and a ketone?

  • Fehling's solution

  • H2SO4 solution 

  • NaHSO4

  • NH3


704.

Dry distillation of the mixture of calcium formate and calcium acetate gives

  • acetone

  • acetaldehyde

  • formaldehyde

  • formic acid


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705.

The general formula (RCO)2O represents

  • a ketone

  • an ether

  • an acid anhydride

  • an ester


706.

Reaction of dry HCl with acetone gives

  • aldol

  • chloritone

  • isopropyl alcohol

  • None of the above


707.

Trioxane has the formula , it is prepared from

  • formaldehyde

  • methanol

  • dichloromethane

  • vinyl alcohol


708.

When methyl cyanide is hydrolysed in presence of alkali, the product is

  • acetamide

  • methane

  • CO2 + H2O

  • acetic acid


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709.

The IUPAC name of crototonaldehyde is

  • prop-2-en-1-al

  • propenal

  • but-2-en-1-al

  • butenal


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710.

Which of the following reacts with phenol to give salicylaldehyde after hydrolysis?

  • Dichloro methane

  • Trichloro methane

  • Methyl chloride

  • None of these


B.

Trichloro methane

Phenol reacts with chloroform (trichloromethane) in presence of aqueous sodium or potassium hydroxide at 340 K followed by hydrolysis of the resulting product and gives salicyladehyde. This reaction is called Reimer-Tiemann reaction.

          

Note : In this reaction dichlorocarbene intermediate is formed.


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