CH3Cl2

CH3Cl2 is not a valid chemical formula. The valency of carbon is typically 4, chlorine is 1, and hydrogen is 1. In a molecule containing carbon, hydrogen, and chlorine, the number of bonds must be satisfied. If we assume a carbon atom is the central atom, it can form four bonds. If it is bonded to three hydrogen atoms, it would have used three bonds, leaving one bond free. If it were then bonded to two chlorine atoms, this would require two bonds, totaling five bonds for carbon, which is not possible. Alternatively, if the formula represents a diatomic molecule, the notation is incorrect for representing a simple diatomic compound. If it were intended to represent a molecule with multiple atoms, the arrangement and connectivity are not clearly defined by this formula. Chemical formulas usually indicate the types and number of atoms present. For example, dichloromethane, which contains one carbon, two hydrogen, and two chlorine atoms, has the formula CH2Cl2. In this formula, the carbon atom is bonded to two hydrogen atoms and two chlorine atoms, satisfying its valency of four.