Amines Chemistry Quiz

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| By Catherine Halcomb

Catherine Halcomb

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Quizzes Created: 1384 | Total Attempts: 6,161,764

Questions: 12 | Attempts: 1,412 | Updated: Aug 21, 2023

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Are you a chemistry geek? If yes, you definitely know about Amines. In organic chemistry, amines are compounds that contain a nitrogen atom with a lone pair. Amines are derivatives of ammonia, wherein one or more hydrogen atoms are replaced by a substituent such as an alkyl or aryl group.
Take this quiz to know more about Amines.

Questions and Answers

1.

Hybridization of nitrogen in amine is
- A.
  
  Sp
- B.
  
  Sp2
- C.
  
  Sp3
- D.
  
  Sp.s
Correct Answer
C. Sp3

Explanation
The correct answer is sp3. In amines, the nitrogen atom is bonded to three other atoms and has one lone pair of electrons. This arrangement requires the nitrogen atom to undergo sp3 hybridization, where the s orbital and the three p orbitals of nitrogen combine to form four sp3 hybrid orbitals. These orbitals are then used to form sigma bonds with the other atoms, resulting in a tetrahedral geometry around the nitrogen atom.

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2.

Which of the following formulae has the highest boiling point?
- A.
  
  CH3CH2CH2CH2NH2
- B.
  
  CH3CH2CH2CH3
- C.
  
  CH3CH2CH2CH2Cl
- D.
  
  CH3CH2CH2CH2F
Correct Answer
A. CH3CH2CH2CH2NH2

Explanation
The correct answer is CH3CH2CH2CH2NH2. This molecule contains an amino group (-NH2) which can form hydrogen bonds with other molecules. Hydrogen bonding is a strong intermolecular force that increases the boiling point of a substance. The other molecules listed do not contain a hydrogen bond donor or acceptor, so they do not have the same strong intermolecular forces and therefore lower boiling points.

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3.

Amines are classified as
- A.
  
  Weak acids
- B.
  
  Weak bases
- C.
  
  Strong acids
- D.
  
  Strong bases
Correct Answer
B. Weak bases

Explanation
Amines are classified as weak bases because they can accept protons (H+) from other molecules. This is due to the presence of a lone pair of electrons on the nitrogen atom, which can form a coordinate bond with a proton. However, compared to strong bases, amines have a lower tendency to accept protons and have a weaker ability to donate electrons. Therefore, they are classified as weak bases.

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4.

Which amine is not soluble in water
- A.
  
  Methylamine
- B.
  
  All are water soluble
- C.
  
  Triethylamine
- D.
  
  Diethylamide
Correct Answer
B. All are water soluble

Explanation
All of the given options are water soluble.

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5.

Carbylamine test is given by
- A.
  
  Secondary amine
- B.
  
  Primary amine
- C.
  
  Tertiary amine
- D.
  
  None of these
Correct Answer
B. Primary amine

Explanation
The carbylamine test is given by primary amines. This test involves heating the amine with chloroform and potassium hydroxide, which results in the formation of isocyanides. The presence of isocyanides can be detected by their foul odor. Secondary and tertiary amines do not give this test because they do not have a hydrogen atom attached to the nitrogen atom, which is necessary for the reaction to occur. Therefore, the correct answer is primary amine.

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6.

Which of the following is most basic?
- A.
  
  Ammonia
- B.
  
  Diethylamine
- C.
  
  Triethylamine
- D.
  
  Ethylamine
Correct Answer
B. Diethylamine

Explanation
Diethylamine is the most basic compound among the given options. Basicity is determined by the availability of lone pairs of electrons on the nitrogen atom. Diethylamine has two ethyl groups attached to the nitrogen, which increases the electron density on the nitrogen atom, making it more basic compared to the other compounds. Ammonia has only one methyl group, and ethylamine has one ethyl group attached to the nitrogen, making them less basic than diethylamine. Triethylamine has three ethyl groups, but the steric hindrance caused by the bulky groups decreases its basicity compared to diethylamine.

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7.

What is the major product of the following reaction? CH3CH2Cl + (CH3)2NH ------ ?
- A.
  
  Amide
- B.
  
  2° amine
- C.
  
  1° amine
- D.
  
  3° amine
Correct Answer
D. 3° amine

Explanation
When CH3CH2Cl reacts with (CH3)2NH, the chlorine atom in CH3CH2Cl is replaced by the (CH3)2NH group, resulting in the formation of a 3° amine. A 3° amine is characterized by having three alkyl groups bonded to the nitrogen atom. Therefore, the major product of this reaction is a 3° amine.

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8.

Which amine produces N2 on treatment with HONO?
- A.
  
  Primary
- B.
  
  Tertiary
- C.
  
  Secondary
- D.
  
  Quaternary
Correct Answer
A. Primary

Explanation
Primary amines produce N2 on treatment with HONO because primary amines have a nitrogen atom bonded to only one carbon atom. When primary amines react with HONO (nitrous acid), a diazonium salt is formed. This diazonium salt is unstable and decomposes to release N2 gas, resulting in the formation of a nitroso compound. Tertiary and secondary amines do not produce N2 gas when treated with HONO because they do not have a hydrogen atom bonded directly to the nitrogen atom, which is necessary for the formation of the diazonium salt. Quaternary amines do not have a nitrogen-hydrogen bond, so they also do not produce N2 gas in this reaction.

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9.

Acetonitrile undergoes reaction with LiAlH4 to form
- A.
  
  Ethylamine
- B.
  
  Methylamine
- C.
  
  Dimethyltryptamine
- D.
  
  Trimethylamine
Correct Answer
A. Ethylamine

Explanation
When acetonitrile reacts with LiAlH4, it undergoes reduction to form ethylamine. LiAlH4 is a strong reducing agent and can reduce the nitrile group (-CN) in acetonitrile to an amine group (-NH2). Ethylamine is formed by replacing the nitrile group with an amino group in acetonitrile. Methylamine, dimethyltryptamine, and trimethylamine are not the correct products of this reaction.

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10.

Which amine reacts with nitrous acide to form nitrosamine?
- A.
  
  Ethylamine
- B.
  
  Diethylamine
- C.
  
  Triethylamine
- D.
  
  Isopropyl amine
Correct Answer
B. Diethylamine

Explanation
Diethylamine is the correct answer because it contains two ethyl groups attached to the nitrogen atom. When diethylamine reacts with nitrous acid, it forms a nitrosamine compound. The presence of two ethyl groups enhances the reactivity of diethylamine towards nitrous acid, allowing for the formation of the nitrosamine product.

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11.

Reduction of imine will give
- A.
  
  Acid
- B.
  
  Amine
- C.
  
  Amide
- D.
  
  Alcohol
Correct Answer
B. Amine

Explanation
When an imine is reduced, it undergoes a reaction called imine reduction. In this reaction, the double bond between the carbon and nitrogen in the imine is converted into a single bond, resulting in the formation of an amine. Therefore, the correct answer is amine.

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12.

Hinsberg reagent is
- A.
  
  Pd + BaSO4
- B.
  
  Benzene sulfonic acid
- C.
  
  NH2NH2 + KOH
- D.
  
  Toulenesulfonic acid
Correct Answer
B. Benzene sulfonic acid

Explanation
The correct answer is Benzene sulfonic acid. Hinsberg reagent is a reagent used in organic chemistry to distinguish between primary, secondary, and tertiary amines. It is commonly used in the Hinsberg test, where the amine is reacted with the reagent to form an insoluble sulfonamide. In this case, the Hinsberg reagent is benzene sulfonic acid, which reacts with the amine to form a benzene sulfonamide. This reaction is used to determine the type of amine present in a given compound.

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Current Version
Aug 21, 2023

Quiz Edited by
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Apr 23, 2021

Quiz Created by
Catherine Halcomb

Amines Chemistry Quiz

Hybridization of nitrogen in amine is

Which of the following formulae has the highest boiling point?

Amines are classified as

Which amine is not soluble in water

Carbylamine test is given by

Which of the following is most basic?

What is the major product of the following reaction? CH3CH2Cl + (CH3)2NH ------ ?

Which amine produces N2 on treatment with HONO?

Acetonitrile undergoes reaction with LiAlH4 to form

Which amine reacts with nitrous acide to form nitrosamine?

Reduction of imine will give

Hinsberg reagent is