Acidic Powers & Their Orders - Chemistry Fact Sheet- 1

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.