Which of the following solids is not an electrical conductor ?1.Mg(s)2.TiO(s)3.I2(s)4.H2O(s)

Iodine is a non-polar molecular solid in which iodine molecules are held together by London or dispersion forces. This is soft and non-conductor of electricity.water(s), i.e. ice is a hydrogen bonded molecular solid in which H and O are held together by polar covalent bond and each water molecule is held together by hydrogen bonding. Due to non-ionic nature, it is not electrical conductor.