MF which one of the following elements is unable to form ion? (NEET 2018)

All of these elements belong to the same group. Al, Ga and In all the elements have vacant d-orbitals but boron does not have a vacant d-orbital. So, its not possible for boron to form it can only form. Si O O O O O Pyrosilicate (a) Hexagonal boron nitride (b) Graphite /graphene B N 6.661 A 2.50 A Van der Waals bonds Covalent Bonds C 6.01 A 2.46 A 4 4 SiO 2 3 SiO 2 4 SiO 63 p-BLOCK (Group 13 - 14) Hence, the correct option is (b).