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Resonance

Decreasing or...

Question

Decreasing order of acidic nature of following is:
$(i) H C O O H (i i) P h - C O O H (i i i) P h - O H$
$(i v) C H_{3} C O O H$

(i i i) < (i v) < (i i) < (i)

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(i i) > (i v) > (i) > (i i i)

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(i) > (i i) > (i v) > (i i i)

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(i i) > (i) > (i v) > (i i i)

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Solution

The correct option is C $(i) > (i i) > (i v) > (i i i)$
The more stable the conjugate base of an acid, stronger is the acid.
Formic acid will be the most acidic and phenol will be the least acidic. Electron donating species will destabilise the conjugate anion hence affecting the acidity.

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Similar questions

Order of decreasing acidity of the following is

(I) HCOOH

(II) ${C H}_{3} C O O H$

(III) ${C l}_{2} C H C O O H$

(IV) ${C F}_{3} C O O H$

Order of decreasing acidity of

$(i) H C O O H (i i) C H_{3} C O O H (i i i) C l_{2} C H C O O H (i v) C F_{3} C O O H i s$

- I

- C N

- N O_{2}

- N H_{2}

- F

+ I

- C H_{3}

- C D_{3}

- C T_{3}

- C H D_{2}

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