Claisen and Cross Claisen condensation Flashcards
- Which of the following is a product formed in Claisen
condensation?
a) β- ester
b) β-ketone
c) β-keto ester
d) Y-diketone
a) β- ester
- Which type of precursor is used as reactant in
intramolecular Claisen condensation?
a) One molecule with an ester end
b) Two molecules of ester
c) One molecule with two ester ends
d) One molecule of ester and enolate
c) One molecule with two ester ends
- Which of the following stamen is incorrect about Claisen
condensation?
a) The product is a β-keto ester which resists
deprotonation by the strong base in the reaction mixture
b) The reaction involves the condensation of two esters in
the presence of strong base
c) A strong base is required to remove H+ from an α-H
position in one of the starting esters
d) A strong base is required to remove H+ from an α-H
position in one of the starting esters
a) The product is a β-keto ester which resists
- Lye is used in soap-making. Lye is a concentrated
solution of which ionic compound?
a) K2CO3
b) CuSO4
c) NaOH
d) NaCl
a) K2CO3
- Which of the following term describe saponification?
a) Cleaving of ester molecules into carboxylic acid and
alcohol
b) Dehydration synthesis by removing water
c) Hydrolysis of a salt by adding a weak acid
d) Synthesis of two alkyl groups to make an ether
a) Cleaving of ester molecules into carboxylic acid and
alcohol
- Which of the following is considered a useful alkali in
saponification reactions?
a) CCl4
b) Cl–
c) NaOH
d) Pb+
c) NaOH
- Saponification value is the number of milligrams of KOH
required to saponify what present in the 1g of oil or fat?
a) Salts
b) Hydrocarbon
c) Fatty acids
d) unsaturation
c) Fatty acids
- Which of the following is a product formed in Claisen
condensation?
a) β- ester
b) β-ketone
c) β-keto ester
d) Y-diketone
c) β-keto ester
- Which of the following compound is an industrial
manufacturing product by saponification?
a) Sodium chloride
b) Potassium hydroxide
c) Glycerol
d) Sodium hydroxide
c) Glycerol
- Which of the following fat or oil is unsaponifiable?
a) Paraffin wax
b) Bee wax
c) Olive oil
d) Shea butter
a) Paraffin wax
- Which of the following statement is true about
saponification value of oil?
a) The shorter the chain of fatty acid, the higher is the
saponification value
b) The shorter the chain of fatty acid, the higher is the
saponification value
c) The higher the saturation in chain of fatty acid, the
lower is the saponification value
d) The lower the saturation in chain of fatty acid, the
higher is the saponification value
a) The shorter the chain of fatty acid, the higher is the
saponification value
- Soap can be precipitated out by salting by using which
chemical compound?
a) Sodium chloride
b) Potassium hydroxide
c) Glycerol
d) Sodium hydroxide
a) Sodium chloride
- Which of the following stamen is incorrect about Claisen
condensation?
a) The product is a β-keto ester which resists
deprotonation by the strong base in the reaction mixture
b) The reaction involves the condensation of two esters in
the presence of strong base
c) A strong base is required to remove H+ from an α-H
position in one of the starting esters
d) A strong base is required to remove H+ from an α-H
position in one of the starting esters
a) The product is a β-keto ester which resists
deprotonation by the strong base in the reaction mixture
- Which type of precursor is used as reactant in
intramolecular Claisen condensation?
a) One molecule with an ester end
b) Two molecules of ester
c) One molecule with two ester ends
d) One molecule of ester and enolate
c) One molecule with two ester ends
- Dieckmann Condensation is intramolecular
condensation of ……. to form cyclic product.
a) diamide
b) diol
c) diester
d) diketone
c) diester
- What is the other name for the intramolecular Claisen
condensation?
a) Perkin condensation
b) Stobbe condensation
c) Knoevenagel condensation
d) Dieckmann condensation
d) Dieckmann condensation
- Ethylamine can be prepared by the action of bromine
and caustic potash on which compound?
a) Acetamide
b) Propionamide
c) Formamide
d) Methyl cyanide
b) Propionamide
- The amine formed from an amide by means of bromine
and alkali has how many number of carbon atoms?
a) Same number of C atoms as that of amide
b) One less C atom than that of amide
c) One more C atom than that of amide
d) Two more C atoms than that of amide
b) One less C atom than that of amide
- When methyl iodide is heated with ammonia, what is
the product obtained?
a) Methylamine
b) Dimethylamine
c) Trimethylamine
d) A mixture of the above three amines
d) A mixture of the above three amines
- Reduction of nitroalkanes yields which compound?
a) Acid
b) Alcohol
c) Amine
d) Diazo compounds
b) Alcohol
- Which one of the following compound gives a secondary
amine on reduction?
a) Nitromethane
b) Nitrobenzene
c) Methyl isocyanide
d) Methyl cyanide
c) Methyl isocyanide
- The Hinsberg’s method is used for which of the
following?
a) Preparation of primary amines
b) Preparation of secondary amines
c) Preparation of tertiary amines
d) Separation of amine mixtures
d) Separation of amine mixtures
- What is the name of the reaction when acetamide
changes into methylamine?
a) Hofmann bromamide reaction
b) Hofmann reaction
c) Friedel-Craft’s reaction
a) Hofmann bromamide reaction
- When ethanol is mixed with ammonia and passed over
alumina the compound formed is which compound?
a) C2H5NH2
b) C2H4
c) C2H5OC2H5
d) CH3OCH3
a) C2H5NH2
- Which of the following reactions will not give primary
amine?
a) CH3CONH2 + KOH.Br2
b) CH3CN + LiAlH4
c) CH3NC + LiAlH4
d) CH3CONH2 + LiAlH4
c) CH3NC + LiAlH4
- Which type of amine is produced by reaction of ketones
with primary amines, followed by reduction?
a) Secondary Aromatic amine
b) N-substituted amine
c) N, N-disubstituted amine
b) N-substituted amine
- Which type of amine is produced by reaction of
ketones with secondary amines, followed by reduction?
a) Secondary Aromatic amine
b) N-substituted amine
c) N, N-disubstituted amine
d) Primary aromatic amine
c) N, N-disubstituted amine
- What is the characteristic smell of liquid amines?
a) Fish like smell
b) Rotten egg smell
c) Fruity smell
d) Bitter almond smell
a) Fish like smell
- Which of the following have less melting point than
amine?
a) Alcohol
b) Phosphine
c) Carboxylic acid
d) Ether
b) Phosphine
- Which of the following compound is expected to be
most basic?
a) Aniline
b) Methylamine
c) Hydroxylamine
d) Ethylamine
d) Ethylamine
- A solution of methyl amine shows which type of
property with litmus paper?
a) Turns blue litmus red
b) Turns red litmus blue
c) Does not affect red or blue litmus
d) Bleaches litmus
b) Turns red litmus blue
- Which of the following statement is true about methyl
amine?
a) Methyl amine is slightly acidic
b) Methyl amine is less basic than NH3
c) Methyl amine is stronger base than NH3
d) Methyl amine forms salts with alkali
c) Methyl amine is stronger base than NH3
- By the presence of a halogen atom in the ring, what is
the effect of this on basic properties of aniline?
a) Increased
b) Decreased
c) Unchanged
d) Doubled
a) Increased
- If methyl is alkyl group, then which order of basicity is
correct?
a) R2NH > RNH2 > R3N > NH3
b) R2NH > R3N > RNH2 > NH3
c) RNH2 > NH3 > R2NH > R3N
d) NH3 > RNH2 > R2NH > R3N
a) R2NH > RNH2 > R3N > NH3
- Which statement is an incorrect statement?
a) Amines form hydrogen bond
b) Ethyl amine has higher boiling point than propane
c) Methyl amine is more basic than ammonia
d) Dimethyl amine is less basic than methyl amine
d) Dimethyl amine is less basic than methyl amine
- Which of the following amine has highest boiling point?
a) Butyl amine
b) Diethylamine
c) Triethylamine
d) Dipropylamine
d) Dipropylamine
- Unpleasant smelling carbylamines are formed by
heating alkali and chloroform with which of the following?
a) Any amine
b) Any aliphatic amine
c) Any aromatic amine
d) Any primary amine
d) Any primary amine