Aromatic Compounds Containing Nitrogen - Result Question 16

####16. The correct decreasing order for acid strength is

(a) FCH2COOH>NCCH2COOH

(2019 Main, 9 Jan I)

$$

NO _2 CH _2 COOH>ClCH _2 COOH $$

(b) CNCH2COOH>O2NCH2COOH

>FCH2COOH>ClCH2COOH

(c) NO2CH2COOH>NCCH2COOH

>FCH2COOH>ClCH2COOH

(d) NO2CH2COOH>FCH2COOH

>CNCH2COOH>ClCH2COOH

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Answer:

Correct Answer: 16. (c,d)

Solution:

  1. All the given compounds are α-monosubstituted acetic acid derivatives and the α-substitutions have been made by strong I groups/atoms. More powerful the I group, stronger will be the acid.

I power of different groups is as follows :

NO2>CN>F>Cl.

Thus, the correct decreasing order for acid strength is:

NO2CH2COOH>NCCH2COOH>FCH2COOH

>ClCH2COOH.



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