RCOO⁻ > HS⁻ > RCOOH > ROH

HS⁻ > RCOO⁻ > RCOOH > ROH

HS⁻ > RCOO⁻ > ROH > RCOOH

RCOO⁻ > HS⁻ > ROH > RCOOH

Strong mesomeric effect

Hyperconjugative effect

Inductive effect only

Hydrogen bonding

Phenol

o−fluorophenol

m−fluorophenol

p−fluorophenol

Resonance

Hyperconjugation

Electromeric effect

Inductive effect

Cyclopentadiene has an acidic hydrogen

Squaric acid is highly acidic

Aniline is more basic than ammonia

Aniline is less basic than ammonia