5-chloro-2-pentyne. The chain must be numbered starting with the end nearest the triple bond.
The reactants are all the formulas to the left of the arrow, which are:
hcI(aq) nahco3(aq)
2MgO
This is called redox reaction. Oxygen is the oxidizing agent to receive 2 electrons from Mg.
Mg is the reducing agent to give 2 electrons to O.
Mg becomes Mg2+ and O becomes O2-. These 2 ions form an ionic structure called MgO
