PhysChemTutor's answer to Jonathan's Secondary 4 Chemistry Singapore question.
From the looks of it,
X is most likely Carbon (C) or Silicon (C)
Y is most likely to be Oxygen (O) or Sulfur (S)
Z is a halogen (eg. Cl, Br I)
X is most likely Carbon (C) or Silicon (C)
Y is most likely to be Oxygen (O) or Sulfur (S)
Z is a halogen (eg. Cl, Br I)