Amines
Q. What is the boiling point trend among primary, secondary, and tertiary amines?
A.
Primary > Secondary > Tertiary
B.
Tertiary > Secondary > Primary
C.
Secondary > Primary > Tertiary
D.
All have the same boiling point
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Solution
Primary amines have higher boiling points than secondary and tertiary amines due to stronger hydrogen bonding.
Correct Answer: A — Primary > Secondary > Tertiary
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Q. What is the boiling point trend of amines compared to alkanes?
A.
Higher
B.
Lower
C.
Same
D.
Varies
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Solution
Amines have higher boiling points than alkanes due to hydrogen bonding.
Correct Answer: A — Higher
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Q. What is the boiling point trend of primary, secondary, and tertiary amines?
A.
Primary > Secondary > Tertiary
B.
Tertiary > Secondary > Primary
C.
Secondary > Primary > Tertiary
D.
All have the same boiling point
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Solution
Primary amines have higher boiling points due to stronger hydrogen bonding compared to secondary and tertiary amines.
Correct Answer: A — Primary > Secondary > Tertiary
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Q. What is the general formula for secondary amines? (2021) 2021
A.
RNH2
B.
R2NH
C.
R3N
D.
RNH
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Solution
The general formula for secondary amines is R2NH, where R represents an alkyl or aryl group.
Correct Answer: B — R2NH
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Q. What is the IUPAC name of the compound CH3CH2NH2? (2021)
A.
Ethylamine
B.
Dimethylamine
C.
Propylamine
D.
Methylamine
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Solution
The IUPAC name of CH3CH2NH2 is Ethylamine, as it consists of an ethyl group attached to an amine.
Correct Answer: A — Ethylamine
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Q. What is the main product when an amine reacts with an acyl chloride?
A.
Amide
B.
Ester
C.
Alcohol
D.
Aldehyde
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Solution
The reaction of an amine with an acyl chloride produces an amide.
Correct Answer: A — Amide
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Q. What is the main product when an amine reacts with an alkyl halide?
A.
Amide
B.
Quaternary ammonium salt
C.
Alcohol
D.
Ester
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Solution
The main product is a quaternary ammonium salt when an amine reacts with an alkyl halide, as the amine can be further alkylated.
Correct Answer: B — Quaternary ammonium salt
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Q. What is the pKb value of a weak base like aniline? (2020)
A.
Less than 5
B.
Around 9
C.
Around 14
D.
Greater than 15
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Solution
Aniline has a pKb value around 9, indicating it is a weak base.
Correct Answer: B — Around 9
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Q. What is the pKb value of a weak base like methylamine?
A.
Less than 7
B.
Equal to 7
C.
Greater than 7
D.
Undefined
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Solution
Methylamine is a weak base, so its pKb value is less than 7.
Correct Answer: A — Less than 7
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Q. What is the product of the reaction between ammonia and ethyl bromide?
A.
Ethylamine
B.
Diethylamine
C.
Triethylamine
D.
Ammonium bromide
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Solution
The reaction produces Ethylamine as ammonia acts as a nucleophile and replaces the bromine atom.
Correct Answer: A — Ethylamine
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Q. What is the product of the reaction between an amine and an acid?
A.
Amide
B.
Salt
C.
Ester
D.
Alcohol
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Solution
The reaction between an amine and an acid produces a salt, as the amine acts as a base and accepts a proton from the acid.
Correct Answer: B — Salt
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Q. Which amine is a strong base due to steric hindrance? (2022)
A.
Methylamine
B.
Ethylamine
C.
Tert-butylamine
D.
Aniline
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Solution
Tert-butylamine is a strong base due to steric hindrance that prevents protonation, making it more stable.
Correct Answer: C — Tert-butylamine
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Q. Which amine is known for its fishy odor?
A.
Methylamine
B.
Ethylamine
C.
Trimethylamine
D.
Aniline
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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 used in the preparation of dyes?
A.
Aniline
B.
Methylamine
C.
Dimethylamine
D.
Ethylamine
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Solution
Aniline is widely used in the preparation of dyes due to its reactivity.
Correct Answer: A — Aniline
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Q. Which of the following amines is the most basic? (2023) 2023
A.
Methylamine
B.
Aniline
C.
Ethylamine
D.
Dimethylamine
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Solution
Dimethylamine is the most basic due to the electron-donating effect of the two methyl groups, which increases the availability of the lone pair on nitrogen.
Correct Answer: D — Dimethylamine
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Q. Which of the following is a primary amine? (2022) 2022
A.
Ethylamine
B.
Dimethylamine
C.
Trimethylamine
D.
Aniline
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Solution
Ethylamine (C2H5NH2) is a primary amine as it has one alkyl group attached to the nitrogen atom.
Correct Answer: A — Ethylamine
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Q. Which reaction is used to prepare amines from alkyl halides? (2020)
A.
Nitration
B.
Hydrogenation
C.
Nucleophilic substitution
D.
Electrophilic substitution
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Solution
Amines can be prepared from alkyl halides through nucleophilic substitution reactions where the amine acts as a nucleophile.
Correct Answer: C — Nucleophilic substitution
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Q. Which reaction is used to prepare amines from alkyl halides? (2020) 2020
A.
Hydrogenation
B.
Nucleophilic substitution
C.
Electrophilic substitution
D.
Dehydrohalogenation
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Solution
Amines can be prepared from alkyl halides through nucleophilic substitution reactions, where the halide is replaced by an amine group.
Correct Answer: B — Nucleophilic substitution
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