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 Multiple Choice QuestionsMultiple Choice Questions

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61.

The reaction,

C6H5CHO + CH3COOC2H5  C6H5CH = CHCOOC2H5 , is called

  • Benzoin condensation

  • Claisen condensation

  • Cannizaro's reaction

  • Perkin reaction


B.

Claisen condensation

The above reaction is known as Claisen condensation.

In this reaction, aromatic aldehyde condenses with esters having α- hydrogen atoms, such as, ethyl acetate, in the presence of metallic Na and C2H5OH to form esters of α, β- unsaturated acids.

C6H5CHO + H2CH - COOC2H5 C2H5OHNa C6H5CH = CHCOOC2H5 + H2O (ethyl cinnamate)


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62.

Which one of the following reactions is called Rosenmund reaction ?

  • Aldehydes are reduced to alcohols

  • Acids are converted to acid chlorides

  • Alcohols are reduced to hydrocarbons

  • Acid chlorides are reduced to aldehydes


63.

In a set of reactions, acetic acid yielded a product D.

CH3COOH SOCl2  A anhyd. AlCl3Benzene B HCN C HOH  D

The structure of D would be


64.

The major organic product formed from the following reaction (ii) LiAlH4 (iii) H2O(i) CH3NH2 ... is


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65.

Aldehydes or ketones are treated with-bromo ester in the presence of zinc to form α-hydroxy ester followed by dehydration to form α,β-unsaturated ester.This reaction is known as:

  • Witting reaction.

  • Tischenko reaction.

  • Reformatsky reaction.

  • Crossed-cannazzaro's reaction.


66.

The correct structure of the stable compound which is obtained when acetophenone react with a base C2H5OH is


67.

Indicate correct synthesis of carboxylic acid from organometallic compound :

  • All of the above


68.

In the following reduction, reducing agent used is:

  • DIBAH

  • LiAlH4

  • NaAlH4

  • H2/PdBaSo4


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69.

HCHO reacts with CH3MgI to give:

  • CH3CH2OH

  • CH3OH

  • CH3CH2I

  • CH3I


70.

Which among the following is strongest acid ?

  • H(ClO)O2

  • H(ClO)O3

  • H(ClO)O

  • H(ClO)


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