MCQs-based questions and answers on Active Methylene Compounds in organic chemistry.
Malonic ester can be used to prepare which of the following?
- Carboxylic acids
- Amino acids
- Keto acids
- All A, B, and C
Question’s Answer: All A, B, and C
What is the order of percentage enolic character of malonic ester (I), acetoacetic ester (II) and cyanoacetic ester (III)?
- II>I>II
- III>II>1
- I>II>III
- II>III>I
Question’s Answer: II>III>I
For preparation of various monocarboxylic acids malonic ester hydrolysis is treated with which of the following?
- NaO C2H5
- Na/C2H5OH
- NaO C2H5
- RX
Question’s Answer: NaO C2H5
____is formed when Malonic ester reacts with urea in presence of POCI?
- Parabamic acid
- Barbituric acid
- Veronal
- Luminal
Question’s Answer: Barbituric acid
In its synthetic applications cyanoacetic ester closely resembles
- Ethyl acetoacetate
- Acetoacetic ester
- Nitroacetic ester
- Malonic ester
Question’s Answer: Malonic ester
The compound with which cyanoacetic ester can react but malonic ester cannot is
- Acetone
- Acetaldehyde
- Acid halide
- Alkyl halide
Question’s Answer: Acetone
The reaction used for the preparation of ethyl acetoacetate starting from ethyl acetate is known as
- Cannizzaro reaction
- Claisen condensation
- Michael condensation
- Clasien-Schmidt reaction
Question’s Answer: Claisen condensation
The enolic form of acetonacetic ester as compared to ketonic form contains ____.
- One extra lone pair
- One extra double bond
- One less double bond
- Both have same number of σ, л bonds and lone pairs
Question’s Answer: Both have same number of σ, л bonds and lone pairs
Why Keto-enol tautomerism arises?
- Due to Migration of enolic group
- Due to Migration of a keto group
- Due to Migration of a proton
- Due to Migration of hydroxyl group
Question’s Answer: Due to Migration of a proton
Which is true regarding Tautomers?
- Tautomers must have Dynamic equilibrium between functional isomers
- Tautomers must have Same functional group
- Tautomers must have Same position of double bond
- Tautomers must have Static equilibrium between functional
Question’s Answer: Tautomers must have Dynamic equilibrium between functional isomers
What is the order of enolic contents of CH3COCH2COOC2H5(I), CH3COCH2COCH3(II) and CH3COCH3CHO(III)?
- I > II > III
- I > III > II
- III > II > I
- II > III > I
Question’s Answer: II > III > I
___________is not a reaction of enolic form of acetoacetic ester.
- Coloration with FeCl3
- Addition of bromine
- Acetylation
- Reaction with HCN
Question’s Answer: Reaction with HCN
Ethyl acetoacetate when boiled with aqueous KOH undergoes hydrolysis to form mainly ________ .
- CH3COCH2 COOH
- CH3COOH
- CH3 CO CH3
- CH3COCOOH
Question’s Answer: CH3 CO CH3
Which is form after Reaction of ethyl acetoacetate with phenyl hydrazine?
- Methyl isoxazolone
- Methyl isoxapyrazolone
- 3-Methyl-1-phenylpyrazolone
- Dimethyl phenyl oxazolone
Question’s Answer: 3-Methyl-1-phenylpyrazolone
Ethyl acetoacetate may be used to prepare
- Ketonic acids
- Ketones
- Carboxylic acids
- All A, B, and C
Question’s Answer: All A, B, and C
Which of the following can be formed by Reaction of sodium ethoxide with malonic ester?
- Resonance stabilized free radical
- Resonance stabilized cation
- Resonance stabilized anion
- Resonance stabilized electrophile
Question’s Answer: Resonance stabilized anion
Succinic acid may be obtained from sodiumalonic ester by its reaction with ______ by hydrolysis.
- R-X
- Dil.HCl
- Alc.KOH
- I2
Question’s Answer: I2
A reactive methylene group is a methylene group present between what kind of groups.
- Electron donating groups
- Carbonyl groups
- Hydroxyl groups
- Amino groups
Question’s Answer: Carbonyl groups
Which is not a reactive methylene compound?
- CH3CO CH2COOC2H5
- C2H5OOCCH2CH2CN
- C2H500CCH2COOC2H5
- C2H5OOCCH2CH2NH2
Question’s Answer: C2H5OOCCH2CH2NH2
Which is the compound which exhibits keto-enol tautomerism?
- Câ‚‚H5O OC CHâ‚‚COCH
- Câ‚‚H5O OCCHâ‚‚NOâ‚‚
- Câ‚‚H5OOCCHâ‚‚CN
- Câ‚‚H5O OC CHâ‚‚CN
Question’s Answer: C₂H5O OC CH₂COCH
More Organic chemistry MCQs
- Organic chemistry MCQs
- Active Methylene Compounds MCQs
- Alcohols and Phenols MCQs
- Carbonyl Compounds MCQs
- Halogenated Organic Compounds MCQs
- Carboxylic Acids MCQs
- Hydrocarbons MCQs
- Nitrogen-Containing Organic Compounds MCQs
- Polymers MCQs
- Nomenclature of Organic Compounds MCQs
- Organic Acids and Bases MCQs
- Organic Spectroscopy MCQs
- Purification and Characterization of Organic Compounds MCQs
- Reaction Mechanism MCQs
- Stereochemistry MCQs
- Organic Molecules MCQs
- CHEMISTRY MCQs From all subjects of Chemistry