Free Test Acidity – NEET

Q1: Which of the following compounds has the highest acidity?

A. Formic acid B. Acetic acid C. Propanoic acid D. Butanoic acid

Q2: Which of the following decreases the acidity of carboxylic acids?

A. Electron-withdrawing group B. Electron-donating group C. Resonance D. Hydrogen bonding

Q3: Which has greater acidity: benzoic acid or acetic acid?

A. Benzoic acid B. Acetic acid C. Both are equally acidic D. None of these

Q4: Why is chloroacetic acid more acidic than acetic acid?

A. Chlorine donates electrons B. Chlorine withdraws electrons C. It has more hydrogens D. None of these

Q5: Which of the following is the least acidic?

A. Trichloroacetic acid B. Chloroacetic acid C. Acetic acid D. Formic acid

Q6: Acidity of carboxylic acids is due to:

A. π-bond character B. Resonance stabilization of conjugate base C. Hydrogen bonding D. Inductive effect

Q7: Which is more acidic: formic acid or benzoic acid?

A. Formic acid B. Benzoic acid C. Both equal D. Cannot be predicted

Q8: Which compound has the lowest pKa?

A. Trichloroacetic acid B. Acetic acid C. Propanoic acid D. Benzoic acid

Q9: Why is trifluoroacetic acid highly acidic?

A. Due to resonance B. Due to strong -I effect of fluorine C. Due to hydrogen bonding D. Due to large size

Q10: Which of the following does NOT affect acidity?

A. Inductive effect B. Hydrogen bonding C. Tautomerism D. Resonance stabilization

Q11: Which is most acidic?

A. CH3COOH B. CCl3COOH C. CH2ClCOOH D. CH3CH2COOH

Q12: How does branching affect acidity?

A. Increases acidity B. Decreases acidity C. No effect D. Depends on position

Q13: Which acid is stronger: formic acid or chloroacetic acid?

A. Formic acid B. Chloroacetic acid C. Both equal D. None

Q14: Effect of NO₂ group on benzoic acid acidity:

A. Increases acidity B. Decreases acidity C. No effect D. Makes it neutral

Q15: In aqueous solution, acetic acid ionizes to give:

A. Acetate ion and H⁺ B. Ethanol and H⁺ C. Carbon dioxide D. Hydroxide ion

Q16: Which group increases acidity the most?

A. -NO₂ B. -CH₃ C. -OCH₃ D. -NH₂

Q17: What is the pKa of acetic acid approximately?

A. 1 B. 4.7 C. 7 D. 10

Q18: Which of these is not a carboxylic acid?

A. Formic acid B. Acetic acid C. Methanol D. Propanoic acid

Q19: Acidity increases in the order:

A. CH3COOH < CH2ClCOOH < CCl3COOH B. CCl3COOH < CH2ClCOOH < CH3COOH C. CH2ClCOOH < CH3COOH < CCl3COOH D. CH3COOH < CCl3COOH < CH2ClCOOH

Q20: Why is benzoic acid less acidic than nitrobenzoic acid?

A. NO2 donates electrons B. NO2 withdraws electrons C. Both are equal D. Benzoic acid is aromatic

Quiz for Acidity