Topic 4: Bonding & Structure (SL & HL)

Which molecule is likely to be the most polar?

• CO₂

• CF₄

• CH₂F₂

• CF₂Cl₂

Answer explanation

What is the electron domain geometry and the molecular geometry of the carbonate ion, CO₃^2-?

• Electron domain: trigonal planar; molecular: trigonal pyramidal

• Electron domain: tetrahedral; molecular: trigonal pyramidal

• Electron domain: tetrahedral; molecular: trigonal planar

• Electron domain: trigonal planar; molecular: trigonal planar

Answer explanation

Which series shows the correct order of metallic bond strength from strongest to weakest?

• Rb > Ca > K > Al

• Rb > K > Ca > Al

• Al > Ca > K > Rb

• Al > K > Ca > Rb

Answer explanation

What is the correct formula for magnesium phosphate?

• Mg(PO₄)₂

• Mg₃(PO₄)₂

• MgPO₄

• Mg₂(PO₄)₃

Answer explanation

Which compound has the shortest C to O bond?

• CO

• CH₃CHO

• CH₃CH₂OH

• CO₂

Answer explanation

Which describes a defining feature of a resonance structure?

• Single bonds are broken

• Resonance forms are structural isomers

• Presence of both ionic and covalent bonds

• Double bonds can be drawn in different positions

Answer explanation

Which statements are correct for all ionic compounds?

1: They conduct electricity when solid.

2: They have high melting points.

3: They form giant (lattice) structures.

• 1 and 3 only

• 2 and 3 only

• 2 only

• 1, 2 and 3

Answer explanation

Which species does not have resonance structures?

• C₆H₆

• CO₃^2-

• C₂H₄

• O₃

Answer explanation

What is the order of increasing boiling point?

• CH₂OHCH₂CH₂OH < CH₃CH₂CH₂CH₂OH < CH₃COCH₂CH₃ < CH₃(CH₂)₃CH₃

• CH₂OHCH₂CH₂OH < CH₃COCH₂CH₃ < CH₃CH₂CH₂CH₂OH < CH₃(CH₂)₃CH₃

• CH₃(CH₂)₃CH₃ < CH₃COCH₂CH₃ < CH₃CH₂CH₂CH₂OH < CH₂OHCH₂CH₂OH

• CH₃(CH₂)₃CH₃ < CH₃CH₂CH₂CH₂OH < CH₃COCH₂CH₃ < CH₂OHCH₂CH₂OH

Answer explanation

Which molecule contains an incomplete octet of electrons?

• NH₃

• BH₃

• H₂S

• PH₃

Answer explanation