Unit 4 Amino Acids and Amides PA

Question 1

Name the molecule CH3NH2

Answer 1

Methylamine

Question 2

O
||
H-N-CH2-C-O-H

Give the IUPAC name of this amino acid

Answer 2

2-amino ethanoic acid

Question 3

Draw the structure of 2-amino 3-methyl butanoic acid

Answer 3

O
                ||
H2N-CH-C-O-H
          |
         CH(CH3)
          |
         CH3

Question 4

What type of ion is an amino acid at neutral pH?

Answer 4

Zwitterion

Question 5

What is a chain of amino acids called?

Answer 5

A Polypeptide or Protein

Question 6

Name
O H
II I
CH3-C-N-CH3

Answer 6

N-Methylethanamide

Question 7

What is the strongest type of intermolecular forces between amide molecules? Between what do these occur?

Answer 7

Hydrogen bonding

Between the lone pair of electrons on the O and the hydrogen attached to the amide group

Question 8

Name the two reagents used to convert amides into amines

Answer 8

1) H2O

2) LiAlH4

Question 9

What type of reaction results in a peptide bond?

Answer 9

Condensation reaction

Question 10

What property causes optical isomerism to occur in most amino acids? On which atom in the molecule is this?
                 O
                 II
H2N- CH-C-OH
           I
           R

Answer 10

A chiral carbon, marked with a *
                  O
                  II
H2N- C*H-C-OH
           I
           R

Question 11

Give the IUPAC name of the only amino acid which does not exist as a pair of optical isomers. What is the R group of this molecule?

Answer 11

Aminoethanoic acid

The R group is a H atom

Question 12

what is the general reaction for the production of an amide using a primary amine?

Answer 12

Carboxylic Acid + Amine –> Amide + H20

Question 13

Are amides soluble in water?

Answer 13

Short chain amides are soluble because they can form Hydrogen bonds with water molecules.