Carboxylic Acids - Acidic Strength and Factors Affecting it NEET Questions

Organic Chemistry - Organic Compounds Containing Oxygen

Carboxylic Acids - Acidic Strength and Factors Affecting it MCQ Questions


1.
Carboxylic acids are acidic in nature because they can readily donate a proton (H⁺) from their:
A.
Carbonyl oxygen alone, without any hydrogen loss
B.
-CHO (aldehyde) group
C.
Alkyl chain
D.
-COOH (carboxyl) group
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ANSWER :
D. -COOH (carboxyl) group
2.
When a carboxylic acid (R-COOH) loses a proton, it forms a carboxylate ion, represented as:
A.
R-O⁻
B.
R-COOH₂⁺
C.
R-CO⁺
D.
R-COO⁻
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ANSWER :
D. R-COO⁻
3.
The acidic strength of carboxylic acids, compared to alcohols and phenols, generally follows which order?
A.
Carboxylic acids > phenols > alcohols
B.
Alcohols > phenols > carboxylic acids
C.
All three show identical acidic strength
D.
Phenols > carboxylic acids > alcohols
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ANSWER :
A. Carboxylic acids > phenols > alcohols
4.
Carboxylic acids are classified as weak acids because, in aqueous solution, they:
A.
Ionize completely, similar to strong mineral acids
B.
Do not ionize at all in water
C.
Ionize only partially to release H⁺ ions
D.
Only ionize in the presence of a strong base
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ANSWER :
C. Ionize only partially to release H⁺ ions
5.
The acid dissociation constant (Ka) of a carboxylic acid provides a quantitative measure of its:
A.
Colour in aqueous solution
B.
Acidic strength (extent of ionization in water)
C.
Boiling point
D.
Molecular mass
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ANSWER :
B. Acidic strength (extent of ionization in water)
6.
The relationship between pKa and Ka of a carboxylic acid is given by which of the following expressions?
A.
pKa = log(Ka)
B.
pKa = −log(Ka)
C.
pKa = 1/Ka
D.
pKa = Ka × 10
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ANSWER :
B. pKa = −log(Ka)