AP - Advanced Placement Chemical Bonding and Molecular Structure 1

Question 1

What is the molecular geometry and approximate bond angle of XeF₄?

Accepted Answer

Square planar, 90°

Answer

Tetrahedral, 109.5°

Answer

See-saw, ~102°

Answer

Square pyramidal, 90°

Question 2

Which of the following C–O bonds has the shortest bond length?

Accepted Answer

C≡O in CO (bond order 3)

Answer

C–O in CH₃OH (bond order 1)

Answer

C–O in CO₃²⁻ (bond order 1.33)

Answer

C=O in CO₂ (bond order 2)

Question 3

According to molecular orbital theory, what is the bond order of NO and what are its magnetic properties?

Accepted Answer

Bond order = 2.5, paramagnetic

Answer

Bond order = 2, diamagnetic

Answer

Bond order = 3, diamagnetic

Answer

Bond order = 1.5, paramagnetic

Question 4

What is the hybridization of phosphorus in PCl₅ and what molecular geometry results?

Accepted Answer

sp³d; trigonal bipyramidal

Answer

sp²; trigonal planar

Answer

sp³; tetrahedral

Answer

sp³d²; octahedral

Question 5

Which of the following molecules has a non-zero dipole moment?

Accepted Answer

ClF₃

Answer

BF₃

Answer

XeF₄

Answer

PF₅

Question 6

In the Lewis structure of carbon monoxide written as :C≡O:, what are the formal charges on C and O respectively?

Accepted Answer

C = −1, O = +1

Answer

C = 0, O = 0

Answer

C = +1, O = −1

Answer

C = −2, O = +2