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Which of the following esters cannot und...

Which of the following esters cannot undergo Claisen self-condensation

A

`CH_(3)CH_(2)CH_(2)CH_(2)COOC_(2)H_(5)`

B

`C_(6)H_(5)COOC_(2)H_(5)`

C

`C_(6)H_(11)CH_(2)COOC_(2)H_(5)`

D

`C_(6)H_(5)CH_(2)COOC_(2)H_(5)`

Text Solution

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The correct Answer is:
B
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cannot undergoes claisen condensation.

This reaction takes place between two molecules of esters (same or different). One ester should have atleast one alpha -hydrogen atom which behaves as a reagent. The reaction is catalyzed by strong bas elike C_(2)H_(5)barONa^(+) in presence of C_(2)H_(5)OH . The product of this reaction is beta -ketoster: Which of the following esters will undergo Claisen condensation to form acetoacetic ester ?

Knowledge Check

  • which of the following ester does not undergo chlaisen self condensation ?

    A
    `CH_3CH_2CH_2CH_2COOC_2H_5 `
    B
    `C_6H_5 CH_2 COOCH_5 `
    C
    `C_6 H_(11) CH_2 COOC_2 H_5`
    D
    `C_6 H_5 CH_2 COOC _2 H_6 `

  • Which one of the following esters cannot undergo self Claisen condensation?

    A
    `CH_(3)-CH_(2)-CH_(2)-COOC_(2)H_(5)`
    B
    `C_(6)H_(5)COOC_(2)H_(5)`
    C
    `C_(6)H_(11)-CH_(2)-COOC_(2)H_(5)`
    D
    `C_(6)H_(5)-CH_(2)COOC_(2)H_(5)`

  • Which one of the following esters cannot undergo self Claisen condensation ?

    A
    `CH_(3)COOC_(2)H_(5 )`
    B
    `R-CH_(2)-COOC_(2)H_(5)`
    C
    `R-overset(R )overset(|)"CH"-COOC_(2)H_(5)`
    D
    `R-underset(R )underset(|)overset(R )overset(|)"CH"-COOC_(2)H_(5)`

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