If  Phi is fixed at 0º, then which of the following is correct 

a. Clashes occur at ALL Psi angles. 

b. Phi = 0º is physically impossible.

c. Clashes occurs at +10º to -130º

d. Clashes occurs at -90º to -180º

TLS Online TPP Program

#Question id: 27072

#Unit 1. Molecules and their Interaction Relevant to Biology

Choose the incorrect statement regarding the Van der Waals interactions & Hydrogen bonds

1. In Van der Waals interactions greater the area of contact the stronger the interaction.

2. In Van der Waals interactions greater the area of contact the weaker  the interaction.

3. Hydrogen bonds Relative strength is inversely proportional to the polarity More polar atoms form weak H bonds.

4. Hydrogen bonds Relative strength is directly proportional to the polarity More polar atoms form stronger H bonds.

TLS Online TPP Program

#Question id: 27073

#Unit 1. Molecules and their Interaction Relevant to Biology

The potential energy of the interaction for the given pair of the image below is represented by the equation

TLS Online TPP Program

#Question id: 27074

#Unit 1. Molecules and their Interaction Relevant to Biology

Choose the incorrect statement of the following about the Spontaneous dipole-dipole interaction 

TLS Online TPP Program

#Question id: 27075

#Unit 1. Molecules and their Interaction Relevant to Biology

As atom "A" approaches, the electrons of atom "B" will be attracted by the positive end of atom "A". As a result, the electrons of atom "B" will migrate to the left side and make the left side slightly negative. This phenomenon can be explained by 

TLS Online TPP Program

#Question id: 27076

#Unit 1. Molecules and their Interaction Relevant to Biology

Choose the correct statement regarding the Spontaneous dipole - induced dipole interaction 

1. Spontaneous dipole - induced dipole interaction are also known as dispersion or London forces related to orientation effect.

2. The potential energy of an induced dipole-induced dipole interaction is depending on the first ionization energy of the molecule

3. Spontaneous dipole - induced dipole interactions are large networks of intermolecular forces between nonpolar and non-charged molecules and atoms (i.e. alkanes, noble gases, and halogens)

4. In Spontaneous dipole - induced dipole interaction a small increase in the radius, would greatly decrease the potential energy of the interaction.

TLS Online TPP Program

#Question id: 27077

#Unit 1. Molecules and their Interaction Relevant to Biology

The van der Waals interaction as a function of interatomic distance r (on x axis) which of the following graph is correctly representing the relation between attractive and repulsive region vs interatomic distance r