CHEM10050 : Guiry Lecture 17 - Amines

What is the general formula for amines?

a) R-NH2, R2NH, or R3N

b) R-OH, R2O, or R3O

c) R-SH, R2SH, or R3S

d) R-NH, R2NO, or R3N2

a) R-NH2, R2NH, or R3N

Which of the following is an example of an aliphatic amine?

a) Aniline

b) Pyridine

c) Phenethylamine

d) Benzylamine

c) Phenethylamine

Which of the following is a secondary amine?

a) NH2-R

b) R-NH-R

c) R-N-R

d) N-R-R

b) R-NH-R

What is the bond angle of an sp3-hybridized amine assuming the lone pair as a group?

a) 90°

b) 105°

c) 108°

d) 120°

c) 108°

Why are amines basic in nature?

a) Due to the electronegativity of nitrogen

b) Due to the presence of a lone pair of electrons on nitrogen

c) Due to the polarity of the N-H bond

d) Due to the presence of a double bond between nitrogen and carbon

b) Due to the presence of a lone pair of electrons on nitrogen

Which of the following is true about the polarity of the N-H bond compared to the O-H bond?

a) The N-H bond is more polar than the O-H bond.

b) The N-H bond is equally polar as the O-H bond.

c) The N-H bond is less polar than the O-H bond.

d) The N-H bond does not have any polarity.

c) The N-H bond is less polar than the O-H bond.

Which of the following has a higher boiling point, CH3NH2 or CH3OH?

a) CH3NH2

b) CH3OH

c) Both have the same boiling point

d) None of the above

b) CH3OH

What helps amines to be more soluble in water than alkanes?

a) The lower polarity of the N-H bond

b) The weaker H-bonding in NH systems than OH systems

c) The presence of a lone pair of electrons on nitrogen

d) The size of the R group

b) The weaker H-bonding in NH systems than OH systems

Which of the following is an example of an aromatic amine?

a) Ethylamine

b) Aniline

c) Butylamine

d) Dimethylamine

b) Aniline

What is the shape of a sp3-hybridized amine assuming the lone pair as a group?

a) Linear

b) Trigonal planar

c) Tetrahedral

d) Octahedral

c) Tetrahedral

Which of the following compounds contains an amine functional group?

a) Ethanol

b) Methane

c) Aniline

d) Ethanoic acid

c) Aniline

What is the general formula for a primary amine?

a) R-NH2

b) R2NH

c) R3N

d) R4N+

a) R-NH2

What is the shape of an amine with sp3 hybridization?

a) Trigonal planar

b) Tetrahedral

c) Octahedral

d) Linear

b) Tetrahedral

Which of the following is not a physical property of amines?

a) Polarity of the N-H bond is weaker than the polarity of the O-H bond in alcohols

b) Lower polarity of the N-H due to N being less electronegative than O

c) NH systems develop stronger H-bonds than OH systems

d) H-bonding helps amines to be more soluble in water than alkanes

c) NH systems develop stronger H-bonds than OH systems

What is the product of the reaction between an amine and an alkyl halide?

a) A salt

b) An alkene

c) An ester

d) A carboxylic acid

a) A salt

Which of the following amines is most reactive towards alkyl halides?

a) R3N

b) R2NH

c) RNH2

d) NH3

a) R3N

What is the final product when an amine reacts with an alkyl halide twice?

a) A 1° amine

b) A 2° amine

c) A 3° amine

d) A 4° amine

d) A 4° amine

Which of the following compounds is an alkaloid?

a) Ethanol

b) Benzene

c) Cocaine

d) Ethanoic acid

c) Cocaine

Amines are important neurotransmitters in the human body. Which of the following compounds is a neurotransmitter?

a) Serotonin

b) Aspirin

c) Ibuprofen

d) Paracetamol

a) Serotonin

What is the product when an amine group reacts with water?

a) An ammonium ion and a hydroxide ion

b) An amide and a hydrogen ion

c) An amide and a hydroxide ion

d) An ammonium ion and a hydrogen ion

d) An ammonium ion and a hydrogen ion