Chapter 25.2, Problem 3CC

(a)

Interpretation Introduction

Interpretation:

Amino acids that contain the given set of groups or atoms need to be identified and the amino acids which can likely to participate in hydrogen bonding also need to be identified.

Concept introduction:

Amino acids are compounds which have both amine and carboxylic acid group in it.  There are 20 naturally occurring amino acids and all of them differ from each other in the number of carbon atoms, side chain etc.  Some of the amino acids have a cyclic structure also in their structure.  A cyclic structure is the one which is a closed ring form.

To find: the amino acids that has cyclic structures

(b)

Interpretation Introduction

Interpretation:

Amino acids that contain the given set of groups or atoms need to be identified and the amino acids which can likely to participate in hydrogen bonding also need to be identified.

Concept introduction:

Amino acids are compounds which have both amine and carboxylic acid group in it.  There are 20 naturally occurring amino acids and all of them differ from each other in the number of carbon atoms, side chain etc.  Some of the amino acids have an aromatic side chain which means it has an aromatic ring present in the structure.

To find: the amino acids that has aromatic side chain

(c)

Interpretation Introduction

Interpretation:

Amino acids that contain the given set of groups or atoms need to be identified and the amino acids which can likely to participate in hydrogen bonding also need to be identified.

Concept introduction:

Amino acids are compounds which have both amine and carboxylic acid group in it.  There are 20 naturally occurring amino acids and all of them differ from each other in the number of carbon atoms, side chain etc.  Some of the amino acids have a basic group apart from the amine which is in $\alpha$ position.   A basic group is the one which can attract hydrogen or proton towards itself.

To find: the amino acids that exhibit basic groups

(d)

Interpretation Introduction

Interpretation:

Amino acids that contain the given set of groups or atoms need to be identified and the amino acids which can likely to participate in hydrogen bonding also need to be identified.

Concept introduction:

Amino acids are compounds which have both amine and carboxylic acid group in it.  There are 20 naturally occurring amino acids and all of them differ from each other in the number of carbon atoms, side chain etc.  Some of the amino acids have a sulfur atom in their structures.

To find: the amino acids that has sulfur atoms in their structures

(e)

Interpretation Introduction

Interpretation:

Amino acids that contain the given set of groups or atoms need to be identified and the amino acids which can likely to participate in hydrogen bonding also need to be identified.

Concept introduction:

Amino acids are compounds which have both amine and carboxylic acid group in it.  There are 20 naturally occurring amino acids and all of them differ from each other in the number of carbon atoms, side chain etc.  Some of the amino acids have an acidic group apart from the functional acid group.   An acidic group is the one which can donate hydrogen or proton.

To find: the amino acids that exhibit acidic groups

(f)

Interpretation Introduction

Interpretation:

Amino acids that contain the given set of groups or atoms need to be identified and the amino acids which can likely to participate in hydrogen bonding also need to be identified.

Concept introduction:

Amino acids are compounds which have both amine and carboxylic acid group in it.  There are 20 naturally occurring amino acids and all of them differ from each other in the number of carbon atoms, side chain etc.  Hydrogen bonding is the ability of the groups present in the molecule to donate or attract hydrogen.  If a hydrogen atom is bonded to a more electronegative atom means it can involve in hydrogen bonding.

To find: the amino acids that have proton in side chain likely to participate in hydrogen bonding.