Section A (50 marks)
1. Write the structural formulas for each of following organic compounds:
(a) 3,3,4-trimethylhexane
(b) 2,3-dimethylbut-1-ene
(c) octylcyclohexane
(d) 1-bromo-2-chloro-5-iodobenzene
(2 marks each, total 8 marks)
2. Draw and name all the isomers of molecular formula C4H10.
(4 marks)
3. (a) How many atomic orbitals are there in the p-subshell? Explain why.
(4 marks)
(b) Use the orbital diagram to write the electronic configuration of the following
elements in the ground state.
(i) B
(ii) Br
(iii) O2
4+
(iv) Ti
(1 mark each, total 4 marks)
, 4. Draw the Lewis structures of the following molecules and classify them into one of the
exceptions of the octet rules.
(a) NO
(b) BeCl2
(c) PF5
(2 marks each, total 6
marks)
5. Which of calcium oxide, magnesium oxide and magnesium fluoride has the highest
lattice energy? Explain why.
(5 marks)
6. Consider the following chemical transformation:
(a) Name the organic reactant and product, as well as the type of chemical reaction.
(6 marks)
(b) The organic reactant of this chemical reaction can also undergo polymerization.
Name and state an application of the resulting polymer.
(3 marks)
1. Write the structural formulas for each of following organic compounds:
(a) 3,3,4-trimethylhexane
(b) 2,3-dimethylbut-1-ene
(c) octylcyclohexane
(d) 1-bromo-2-chloro-5-iodobenzene
(2 marks each, total 8 marks)
2. Draw and name all the isomers of molecular formula C4H10.
(4 marks)
3. (a) How many atomic orbitals are there in the p-subshell? Explain why.
(4 marks)
(b) Use the orbital diagram to write the electronic configuration of the following
elements in the ground state.
(i) B
(ii) Br
(iii) O2
4+
(iv) Ti
(1 mark each, total 4 marks)
, 4. Draw the Lewis structures of the following molecules and classify them into one of the
exceptions of the octet rules.
(a) NO
(b) BeCl2
(c) PF5
(2 marks each, total 6
marks)
5. Which of calcium oxide, magnesium oxide and magnesium fluoride has the highest
lattice energy? Explain why.
(5 marks)
6. Consider the following chemical transformation:
(a) Name the organic reactant and product, as well as the type of chemical reaction.
(6 marks)
(b) The organic reactant of this chemical reaction can also undergo polymerization.
Name and state an application of the resulting polymer.
(3 marks)
