Q39 / 160 · AP EAMCET 2018 (22 Apr Shift 2) · Chemistry

The order of strengths of the following carboxylic acids is (i) $\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{COOH}$ (ii) $\mathrm{CH}_3-\mathrm{COOH}$ (iii) $\mathrm{C}_6 \mathrm{H}_5-\mathrm{COOH}$ (iv) $\mathrm{C}_6 \mathrm{H}_5-\mathrm{CH}_2 \mathrm{COOH}$

  • Correct answer
    A
    (iii) > (iv) > (ii) > (i)
  • B
    (iv) > (ii) > (iii) > (i)
  • C
    (iii) > (ii) > (iv) > (i)
  • D
    (i) > (iv) > (ii) > (iii)

Solution

(i) $\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{COOH}$ (ii) $\mathrm{CH}_3-\mathrm{COOH}$ (iii) $\mathrm{C}_6 \mathrm{H}-\mathrm{COOH}$ (iv) $\mathrm{C}_6 \mathrm{H}_4-\mathrm{CH}_2-\mathrm{COOH}$ Die to $-I$ effect (iii) is most acidic and order will be (iii) $>$ (iv) $>$ (ii) $>$ (i).

Hence, the correct answer is option: 'A'.

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