Amines
Q. What is the effect of alkyl groups on the basicity of amines?
-
A.
Decrease basicity
-
B.
Increase basicity
-
C.
No effect
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D.
Depends on the size
Solution
Alkyl groups increase the basicity of amines due to their electron-donating effect.
Correct Answer: B — Increase basicity
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Q. What is the effect of electron-donating groups on the basicity of amines?
-
A.
Increase basicity
-
B.
Decrease basicity
-
C.
No effect
-
D.
Depends on the solvent
Solution
Electron-donating groups increase the electron density on the nitrogen atom, thus increasing the basicity of amines.
Correct Answer: A — Increase basicity
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Q. What is the effect of electron-withdrawing groups on the basicity of amines?
-
A.
Increase basicity
-
B.
Decrease basicity
-
C.
No effect
-
D.
Varies with the group
Solution
Electron-withdrawing groups decrease the basicity of amines by reducing the electron density on the nitrogen atom.
Correct Answer: B — Decrease basicity
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Q. What is the hybridization of nitrogen in a primary amine?
-
A.
sp
-
B.
sp2
-
C.
sp3
-
D.
None of the above
Solution
The nitrogen in a primary amine is sp3 hybridized.
Correct Answer: C — sp3
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Q. What is the hybridization of nitrogen in amines?
-
A.
sp
-
B.
sp2
-
C.
sp3
-
D.
sp3d
Solution
Nitrogen in amines is sp3 hybridized due to the presence of three substituents and a lone pair.
Correct Answer: C — sp3
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Q. What is the hybridization of the nitrogen atom in a primary amine?
-
A.
sp
-
B.
sp2
-
C.
sp3
-
D.
sp3d
Solution
The nitrogen atom in a primary amine is sp3 hybridized.
Correct Answer: C — sp3
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Q. What is the hybridization of the nitrogen atom in an amine?
-
A.
sp
-
B.
sp2
-
C.
sp3
-
D.
sp3d
Solution
The nitrogen atom in amines is sp3 hybridized, having a tetrahedral geometry with one lone pair.
Correct Answer: C — sp3
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Q. What is the IUPAC name of CH3NH2?
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A.
Methylamine
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B.
Ethylamine
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C.
Propylamine
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D.
Dimethylamine
Solution
The IUPAC name of CH3NH2 is methylamine.
Correct Answer: A — Methylamine
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Q. What is the main product when an amine is treated with nitrous acid?
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A.
Diazonium salt
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B.
Alcohol
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C.
Aldehyde
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D.
Ketone
Solution
Amines react with nitrous acid to form diazonium salts, which are important intermediates in organic synthesis.
Correct Answer: A — Diazonium salt
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Q. What is the main product when an amine reacts with nitrous acid?
-
A.
Diazonium salt
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B.
Alcohol
-
C.
Aldehyde
-
D.
Amide
Solution
The reaction of an amine with nitrous acid produces a diazonium salt.
Correct Answer: A — Diazonium salt
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Q. What is the main product when ethylamine is treated with nitrous acid?
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A.
Ethyl alcohol
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B.
Ethyl diazonium salt
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C.
Ethylamine hydrochloride
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D.
No reaction
Solution
Ethylamine reacts with nitrous acid to form ethyl diazonium salt, which is a key intermediate in organic synthesis.
Correct Answer: B — Ethyl diazonium salt
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Q. What is the pKb value of a strong base?
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A.
Less than 0
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B.
Equal to 0
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C.
Greater than 0
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D.
Equal to 14
Solution
A strong base has a pKb value less than 0, indicating high basicity.
Correct Answer: A — Less than 0
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Q. What is the pKb value of a weak base?
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A.
Less than 7
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B.
Equal to 7
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C.
Greater than 7
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D.
None of the above
Solution
A weak base has a pKb value greater than 7.
Correct Answer: C — Greater than 7
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Q. What is the primary product when ammonia reacts with an alkyl halide?
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A.
Amine
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B.
Amide
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C.
Alkane
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D.
Alcohol
Solution
The primary product of the reaction between ammonia and an alkyl halide is an amine.
Correct Answer: A — Amine
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Q. What is the primary use of amines in industry?
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A.
Solvents
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B.
Fertilizers
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C.
Dyes
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D.
All of the above
Solution
Amines are used in various industries for solvents, fertilizers, dyes, and more.
Correct Answer: D — All of the above
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Q. What is the product of the reaction between an amine and an acyl chloride?
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A.
Amide
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B.
Ester
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C.
Carboxylic acid
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D.
Alcohol
Solution
Amines react with acyl chlorides to form amides through a nucleophilic acyl substitution reaction.
Correct Answer: A — Amide
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Q. What type of isomerism is shown by secondary amines?
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A.
Structural isomerism
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B.
Geometric isomerism
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C.
Optical isomerism
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D.
All of the above
Solution
Secondary amines can exhibit structural isomerism due to different alkyl groups attached to the nitrogen.
Correct Answer: A — Structural isomerism
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Q. What type of reaction occurs when an amine is treated with a haloalkane?
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A.
Nucleophilic substitution
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B.
Electrophilic addition
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C.
Elimination
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D.
Oxidation
Solution
The reaction between an amine and a haloalkane is a nucleophilic substitution reaction.
Correct Answer: A — Nucleophilic substitution
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Q. What type of reaction occurs when an amine reacts with a nitrous acid?
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A.
Substitution
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B.
Elimination
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C.
Decomposition
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D.
Diazotization
Solution
The reaction of an amine with nitrous acid leads to diazotization, forming a diazonium salt.
Correct Answer: D — Diazotization
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Q. Which amine is expected to have the highest boiling point?
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A.
Methylamine
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B.
Ethylamine
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C.
Dimethylamine
-
D.
Trimethylamine
Solution
Ethylamine has the highest boiling point due to its ability to form stronger hydrogen bonds compared to the others.
Correct Answer: B — Ethylamine
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Q. Which amine is known for its strong fishy odor?
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A.
Methylamine
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B.
Ethylamine
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C.
Trimethylamine
-
D.
Aniline
Solution
Trimethylamine is known for its strong fishy odor, often associated with decaying fish.
Correct Answer: C — Trimethylamine
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Q. Which amine is most likely to undergo electrophilic aromatic substitution?
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A.
Aniline
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B.
Methylamine
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C.
Dimethylamine
-
D.
Triethylamine
Solution
Aniline is most likely to undergo electrophilic aromatic substitution due to the presence of the amino group, which is a strong activating group.
Correct Answer: A — Aniline
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Q. Which amine is most soluble in water?
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A.
Triethylamine
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B.
Methylamine
-
C.
Aniline
-
D.
Benzylamine
Solution
Methylamine is the most soluble in water due to its smaller size and ability to form hydrogen bonds.
Correct Answer: B — Methylamine
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Q. Which amine is used as a local anesthetic?
-
A.
Lidocaine
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B.
Aniline
-
C.
Methylamine
-
D.
Ethylamine
Solution
Lidocaine is an amine used as a local anesthetic.
Correct Answer: A — Lidocaine
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Q. Which amine is used as a solvent in organic reactions?
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A.
Aniline
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B.
Triethylamine
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C.
Methylamine
-
D.
Pyridine
Solution
Triethylamine is commonly used as a solvent in organic reactions.
Correct Answer: B — Triethylamine
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Q. Which of the following amines can form hydrogen bonds with water?
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A.
Tertiary amines
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B.
Primary amines
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C.
Secondary amines
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D.
All of the above
Solution
All types of amines can form hydrogen bonds with water due to the presence of the nitrogen atom.
Correct Answer: D — All of the above
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Q. Which of the following amines can form hydrogen bonds?
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A.
Tertiary amine
-
B.
Primary amine
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C.
Quaternary ammonium
-
D.
None of the above
Solution
Primary amines can form hydrogen bonds due to the presence of a hydrogen atom attached to the nitrogen.
Correct Answer: B — Primary amine
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Q. Which of the following amines has the highest boiling point?
-
A.
Methylamine
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B.
Ethylamine
-
C.
Aniline
-
D.
Dimethylamine
Solution
Aniline has the highest boiling point due to its ability to form strong hydrogen bonds.
Correct Answer: C — Aniline
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Q. Which of the following amines is a strong base?
-
A.
Aniline
-
B.
Methylamine
-
C.
Phenethylamine
-
D.
Benzylamine
Solution
Methylamine is a strong base compared to the others due to the lack of resonance stabilization of the lone pair.
Correct Answer: B — Methylamine
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Q. Which of the following amines is aromatic?
-
A.
Ethylamine
-
B.
Aniline
-
C.
Trimethylamine
-
D.
Cyclohexylamine
Solution
Aniline is an aromatic amine because it contains a benzene ring.
Correct Answer: B — Aniline
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