Q.39. Question: Intramolecular forces ... [FREE SOLUTION]

Chapter 3: Q.39. (page 91)

Question: Intramolecular forces of attraction are often important in holding large molecules together. For example, some proteins fold into compact shapes, held together by attractive forces between nearby functional groups. A schematic of a folded protein is drawn here, with the protein backbone indicated by a blue-green ribbon, and various appendages drawn dangling from the chain. What types of intramolecular forces occur at each labeled site (A鈥揊)?

Short Answer

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Answer

The intermolecular force present at site A is Vander Waals forces, site B is hydrogen bonding, site C is ion-ion interaction and Vander Waals forces, site D is hydrogen bonding, site E is Vander Waals forces, and site F is Vander Waals forces.

Step by step solution

Intermolecular and Intramolecular forces

Intramolecular forces are considered stronger in comparison to intermolecular forces.Intermolecular forces can help identify whether a substance is in a solid, liquid, or gaseous state.

The chemical behavior of a specific substance can be identified with the help of intramolecular forces.

Intermolecular force in the given compounds

All molecules exhibit Vander Waals's force of attraction.

At the labeled site A, the isopropyl group and sec-butyl group are involved in the intermolecular force of attraction. These groups are non-polar, and the intermolecular force existing between the non-polar groups are the dispersion force.

Hence, the labeled site A will contain Vander Waals forces.

At the labeled site B, the bonding occurs between the hydrogen atom and the electronegative atom, oxygen. Hence, the forces present in site B are the Vander Waals forces and hydrogen bonding.

At the labeled site C, the bonding occurs between two charged groups, the ammonium ion and the carboxylate ion. Hence, the forces present in site C are Vander Waals forces and ion-ion interaction.

At the labeled site D, the bonding takes place between the electronegative atom, oxygen, and the hydrogen atom. Hence, the forces present in site D are Vander Waals forces and hydrogen bonding.

At thelabeled site E, the bonding occurs between the oxygen, the electronegative atom, and the hydrogen atom. Hence, the forces present at site E are Vander Waals forces and hydrogen bonding.

At the labeled site F, the groups involved in the intermolecular forces of attraction are the sec-butyl group and benzyl group. These groups are non-polar, and the intermolecular forces present between the non-polar groups are the dispersion forces. Hence, the force that is present at site F is the Vander Waals force.