The compound name which belongs to box[1] is known as Sodium chloride.
It is the common salt.
Before going to answer the second question, first we have to understand ionic and covalent bond.
The ionic bond is formed between electropositive metal and electronegative non metal. In this type of bond,the electropositive metal will lose electrons and forms cation where electronegative element will accpert electrons to form anion.The cations and anions are attracted to each other to form a compound.
The covalent bond is a type of bond in which sharing of electrons will occur to satisfy octet role which will result in the stability of the compound.
Hence the correct answer to the second question will be covalent.
