Target: 10 Questions in 10 minutes

An IB Chemistry data booklet is helpful

1. Which of the following species does NOT contain a π bond?

  • A.   N2H2
  • B.   NO2+
  • C.   C2H4Cl2
  • D.   CO

2. Which type of hybridization for carbon atoms is present in a molecule of benzoic acid, C6H5COOH?

I. sp
II. sp2
III. sp3
  • A.   I only
  • B.   II only
  • C.   I and II only
  • D.   II and III only

3. How many σ and π bonds are present in a molecule of propanone CH3COCH3?

  σ π
A 2 0
B 3 1
C 8 1
D 9 1
4. Which statement is NOT true about the bonding in this molecule? Unknown Bonding in molecule Q4
  • A.   There are π bonds in this molecule.
  • B.   The π bonds are formed by the sideways overlapping of parallel p orbitals.
  • C.   In σ bonds, the electron density is concentrated along the bond axis.
  • D.   σ bonds are formed by the head-on combination of s orbitals.
5. Which of the following molecules shows sp hybridization of an atom?
  • A. CO2
  • B. BCl3
  • C. C2H6
  • D. SO3

Q6-8: These questions are about the amino acid histidine shown here.

Three atoms have been highlighted with circles:

 histidine molecule

6. What are the hybridizations of the circled carbon, oxygen and nitrogen atoms?

  carbon oxygen nitrogen
A sp2 sp2 sp2
B sp3 sp sp2
C sp3 sp2 sp3
D sp3 sp sp3
7. How many σ bonds are there in a molecule of histidine?
  • A. 8
  • B. 11
  • C. 17
  • D. 20
8. How many π bonds are there in a molecule of histidine?
  • A.   1
  • B.   2
  • C.   3
  • D.   4
9.Which of the following molecules does NOT contain a sp2 hybridized nitrogen atom?
  • A.   HNO3
  • B.   NH3
  • C.   N2H2
  • D.   C6H5NO2
10. Which statement is true about the bonding in this molecule ? Hybridization molecule Q10
  • A.   The carbon-carbon triple bond is shorter than the carbon-carbon single bond or the carbon-carbon double bond.
  • B.   A triple bond consists of two σ bond and one π bond.
  • C.   There are four sp2 hybridized carbon atoms in this molecule.
  • D.   There are 8 σ bonds in this molecule.