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Acidic Powers & Their Orders - Chemistry Fact Sheet- 1

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Acidic Powers & Their Orders - Chemistry Fact Sheet- 1

Acidic power
Order
Why ?
1.
III < II < I
Farther the (–I) group (Cl), lesser the acidic strength
2.
I < II < III
Farther the (+I) group, greater the acidic power
3.
II < I < III
—CH3 is electron donating and
— NO2 is electron attracting
4.
II < I < III
—CH3 is electron repelling; decreases acidic strength of phenol
5.
III < I < II
— OCH3 group contains +M effect
and decreases acidic poer.
6.
I < II < III
— NO2 is electron attracting; III is more resonance stabilised than I and also than II. In I, only inductive effect is operative.
7.
I > II > III
sp2 hybridised carbon of I, II are more el-ectronegative hence acid strength is inc-reased. Benzylic (C6H5CH2) is more stab-ilised than allylic (CH2==CHCH2).
8.
I > II > III > IV
Effect of one —COOH on the other decr-eases as its distance between them increases, (COOH)2 is maximum acidic.
9.
II < III < I
—NO2 is electron attracting (–I effect)
10.
III < II < I
—OH shows electron withdrawing nature at o - and m - and electron repelling at p -, o - isomer due to intramolecular bonding in salicylate ion is stronger than m - isomer
11.
III < II < I
—do—
12.
I < III < II
—NH2 is electron donating.

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