MCQs-based questions and answers on Organic Acids and Bases in organic chemistry.
Which is not a reasonable (strong) nucleophile?
- OH–
- NH3
- H2O
- CN–
Question’s Answer: H2O
Higher basiscity of pyridine than pyrrole is justified by which of the following?
- Huckle rule
- Hybridization of nitrogen
- Electron donating effect on amino group
- Both a and b
Question’s Answer: Both a and b
The distinguish among primary, secondary and tertiary alcohol, one would use the following experimental method.
- Sandmeyer reaction
- Witting reaction
- Lucas test
- Ninhydrin test
Question’s Answer: Lucas test
Inorganic acids (HCl, HBr. HNO, etc.) have Ka value
- <10
- >1
- >10
- <1
Question’s Answer: <1
Weak acids have Ka value
- <10-1
- >10-4
- >10-5
- <10-5
Question’s Answer: <10-1
Which acid have highest pKa value?
- CICH2COOH
- CH3COOH
- Hâ‚‚O
- FCH2COOH
Question’s Answer: H₂O
Which have high pKa value?
- Ammonia
- Methylamine
- Pyridine
- Pyrrole
Question’s Answer: Methylamine
It has been observed that all the strong acids show same strength in the aqueous medium. This is known as __.
- Asymmetric effect
- Stark effect
- Salt effect
- Leveling effect
Question’s Answer: Leveling effect
Which statement is true regarding Arrhenius concept?
- This concept is applicable only for aqueous systems
- Neutralization takes place in aqueous medium only
- H ion cannot remain as such in water
- This concept is applicable for non-aqueous systems only
Question’s Answer: This concept is applicable for non-aqueous systems only
Which does not represent Lewis base?
- BF3
- NaNH2
- NaOH
- Pyridine
Question’s Answer: BF3
Which statement do not represent Lewis idea of acids and bases?
- Compounds in which the central atom can expand its octet
- Compounds which have incompletely filled orbitals
- Compounds which have completely filled orbitals
- All simple metal ions like Ag+, Al3+ etc.
Question’s Answer: Compounds which have completely filled orbitals
Which statement is not true with the concept of Bronsted concept of acids and bases?
- concept has many bases that have OH ions
- A base can accept a proton
- An acid can donate a proton This
- This concept is more general
Question’s Answer: This concept has many bases that have OH ions
Which pairs does not represent Lowery acid-base pair?
- H2O + NH3
- CH3NH2+ BF3
- HCl + H2O
- H2O+ Hâ‚‚O
Question’s Answer: CH3NH2+ BF3
Which does not represent Lewis acid?
- ZnCl2
- FeCl3
- BuLi
- BF3
Question’s Answer: BuLi
The polarization in one sigma bond caused by the polarization of an adjacent sigma bond is known as __.
- Inductive effect
- Resonance effectc
- Mesomeric effect
- Salt effect
Question’s Answer: Inductive effect
Which groups exert –I effect?
- -COOH
- -CN
- -NO
- All A, B, and C
Question’s Answer: All A, B, and C
Which sets consists of only polar aprotic solvents?
- DMF, acetonitrile, DMSO
- Acetic acid, DMF, toluene
- DMSO, ethanol, acetonitrile
- Water, hexane, methanol
Question’s Answer: DMF, acetonitrile, DMSO
Why Maleic acid is stronger than, fumeric acid?
- Electron donating effect of-COOH.
- Electron withdrawing effect of -COOH.
- Intramolecular Hydrogen Bonding
- All of A, B, and C
Question’s Answer: Intramolecular Hydrogen Bonding
Which groups does not exert +I effect?
- S1R3
- –COO–
- >C=0
- –CH2Me
Question’s Answer: >C=0
The effect that operates not through bonds, but directly through space is known as __?
- Resonance effect
- Field effect
- Asymmetric effect
- Inductive effect
Question’s Answer: Field effect
Which is true order of amine strength in gas phase?
- CH3NH2 > NH3 > (CH3)3N > (CH3)2N
- (CH3)2NH < (CH3)3N < NH3 > CH3NH2
- (CH3)3N < (CH3)2NH > CH3NH2 > NH3
- NH3 < CH3NH2 < (CH3)2NH < (CH3)3N
Question’s Answer: NH3 < CH3NH2 < (CH3)2NH < (CH3)3N
Which haloacids is stronger acid?
- BrCH2COOH
- CICH2COOH
- FCH2COOH
- ICH2COOH
Question’s Answer: FCH2COOH
Which factors affect the strength of an acid?
- Strength of the H-A bond01
- The nature of the solvent
- Electronegativity of A
- All A, B, and C
Question’s Answer: All A, B, and C
HS is stronger acid than Hâ‚‚O because ______.
- H2S is a gas while HO is liquid
- S-H bond is weaker than O-H bond
- S-H bond is stronger
- H2S forms H-bonding
Question’s Answer: S-H bond is weaker than O-H bond
Which factors affect the strengths of acids and bases?
- Inductive effect
- Hydrogen effect
- Resonance effectc
- All A, B, and C
Question’s Answer: All A, B, and C
The equation which relates the reaction rates and equilibrium constants of many reactions is known as
- Hammett equation
- Taft equation
- Differential equation
- Linear equation
Question’s Answer: Hammett equation
Which statement is not true with respect to applications of Hammett equations?
- It develops a quantitative relationship between structure and reactivity
- This equation can be used to calculate the value of pK
- This equation does not help to calculate the rate of some reactions
- This equation has mechanistic implications
- It classifies the substitutes into two categories
Question’s Answer: This equation does not help to calculate the rate of some reactions
Which statement is not true with respect to limitations of Hammett equation?
- Only applicable to aliphatic systems
- It is only applicable to aromatic systems
- It is not valid for m-substituent
- It is not valid for p-substituent
Question’s Answer: Only applicable to aliphatic systems
Which equations represent linear free energy relationship?
- Hammett equation
- Helmholtz equation
- Taft equation
- Differential equation
Question’s Answer: Taft equation
Which is a nucleophile?
- AICI3
- CN–
- BF3
- H3O+
Question’s Answer: CN–
Which is not a nucleophile?
- CN–
- NH3
- CH3O–
- BF3
Question’s Answer: BF3
Compounds that has more than one electron pair on different atoms and may donate to carbon in substrate known as __..
- Nucleophile
- Ligand
- Ambient nucleophile
- None of A, B, and C
Question’s Answer: Ambient nucleophile
Tert-butyl cation is stabilized through which phenomenon.
- Resonance effect
- Hyperconjugation
- Conjugation effect
- Mesomeric effect
Question’s Answer: Hyperconjugation
In solutions, the acidity of simple alcohols is in the order?
- CH3OH > CH3CH2OH > (CH3)3COH > (CH3)2CHOH
- (CH3)3COH > (CH3)2CHOH > CH3CH2OH > CH3OHc
- CH3CH2OH > CH3OH > (CH3)3COH > (CH3)2CHOH
- CH3OH > CH3CH2OH > (CH3)2CHOH > (CH3)3COH
Question’s Answer: CH3OH > CH3CH2OH > (CH3)2CHOH > (CH3)3COH
In aqueous medium, ______ is the order of amine strength.
- (CH3)2NH > CH3NH > NH3 > (CH3)3N
- NH3 > CH3NH2 > (CH3)2NH > (CH3)3N
- (CH3)2NH > CH3NH2 > (CH3)3N > NH3
- CH3NH2 > (CH3)2NH > NH3 > (CH3)3N
Question’s Answer: (CH3)2NH > CH3NH2 > (CH3)3N > NH3
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