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


7.
A carboxylic acid with a lower pKa value is generally:
A.
Unrelated to the acid's actual strength
B.
A weaker acid, since it ionizes to a lesser extent
C.
A stronger acid, since it ionizes to a greater extent
D.
Neutral in nature, neither acidic nor basic
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ANSWER :
C. A stronger acid, since it ionizes to a greater extent
8.
The relatively high acidic strength of carboxylic acids (compared to alcohols) is mainly attributed to the:
A.
Presence of a triple bond in the -COOH group
B.
Higher molecular mass of carboxylic acids
C.
Complete absence of any oxygen atom in carboxylic acids
D.
Resonance stabilization of the carboxylate ion, in which the negative charge is delocalized equally over both oxygen atoms
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ANSWER :
D. Resonance stabilization of the carboxylate ion, in which the negative charge is delocalized equally over both oxygen atoms
9.
In the resonance structures of the carboxylate ion, the two carbon-oxygen bonds become equivalent, each having a bond order of approximately:
A.
1.5 (intermediate between a single and a double bond)
B.
1.0 (a pure single bond)
C.
3.0 (a triple bond)
D.
2.0 (a pure double bond)
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ANSWER :
A. 1.5 (intermediate between a single and a double bond)
10.
The alkoxide ion (RO⁻), formed by the deprotonation of an alcohol, is a comparatively weaker base/stronger conjugate acid situation than the carboxylate ion mainly because the alkoxide ion:
A.
Is stabilized by an additional carbonyl group
B.
Lacks resonance stabilization and carries a localized negative charge on a single oxygen atom
C.
Has more resonance structures than the carboxylate ion
D.
Contains two oxygen atoms like the carboxylate ion
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ANSWER :
B. Lacks resonance stabilization and carries a localized negative charge on a single oxygen atom
11.
Since the conjugate base (carboxylate ion) of a carboxylic acid is more stable due to resonance, the equilibrium for the ionization of the carboxylic acid shifts further towards:
A.
The product side, resulting in greater ionization and hence greater acidity
B.
The reactant side, resulting in reduced ionization
C.
Neither side, since ionization does not occur at all
D.
A state independent of the conjugate base's stability
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ANSWER :
A. The product side, resulting in greater ionization and hence greater acidity
12.
The presence of an electron-withdrawing group (EWG) near the -COOH group of a carboxylic acid generally causes the acidic strength to:
A.
Become zero (the compound stops being acidic)
B.
Remain completely unaffected
C.
Decrease, since the electron-withdrawing group destabilizes the carboxylate ion
D.
Increase, since the electron-withdrawing group stabilizes the carboxylate ion further
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ANSWER :
D. Increase, since the electron-withdrawing group stabilizes the carboxylate ion further