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Consider the acidity of carboxylic acid 
i) C6H5COOH 
ii) O – HO2C6H4COOH 
iii) p – NO2C6H4COOH 
iv) m – NO2C6H4COOH 
Which of the following order is correct

[DSSSB TGT 2014 (Science)]
A
B
C
D