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Question

The correct decreasing order for acid strength is?


A

FCH2COOH>NCCH2COOH>NO2CH2COOH>ClCH2COOH

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B

CNCH2COOH>O2NCH2COOH>FCH2COOH>ClCH2COOH

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C

NO2CH2COOH>NCCH2COOH>FCH2COOH>ClCH2COOH

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D

NO2CH2COOH>FCH2COOH>CNCH2COOH>ClCH2COOH

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Solution

The correct option is C

NO2CH2COOH>NCCH2COOH>FCH2COOH>ClCH2COOH


The explanation for the correct option:

Option(C):NO2CH2COOH>NCCH2COOH>FCH2COOH>ClCH2COOH

  • The acidic strength of a compound is directly propertional to the electron withdrawing attached to the given compound.
  • Here the order of electron-withdrawing effect can be given as: -NO2>-CN>-F>-Cl.
  • Thus, the acidic strength of the given acids will be :

NO2CH2COOH>NCCH2COOH>FCH2COOH>ClCH2COOH

The explanation for the incorrect option:

Option(A):FCH2COOH>NCCH2COOH>NO2CH2COOH>ClCH2COOH

  • The given order is not correct according to the order of electron-withdrawing group effect attached to given acids.
  • Hence, the given option does not coincide with the correct concept.

Option(B):CNCH2COOH>O2NCH2COOH>FCH2COOH>ClCH2COOH

  • As the electron-withdrawing strength of the group -NO2>-CN, the acidic strength order of NO2CH2COOH should be greater than NCCH2COOH
  • Hence, the given option is the incorrect one.

Option(D):NO2CH2COOH>FCH2COOH>CNCH2COOH>ClCH2COOH

  • The given order is not correct according to the order of the electron-withdrawing group effect attached to given acids.
  • Hence, the given option does not represent the correct concept.

Hence, the correct decreasing order for acid strength is NO2CH2COOH>NCCH2COOH>FCH2COOH>ClCH2COOH, option (C) is the correct answer.


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