Consider the following sequences of molecules and their associated properties: (I) CH ₃ Cl CH ₂ Cl ₂ CHCl ₃ : Dipole moment (II) H ₂ Te H ₂ S H ₂ O : Bond angle (III) CO CO ₂ CO ₃²⁻ : C - O bond length (IV) NO ^+ NO NO ^- : Bond order Which of the above sequences are correct?

Step-by-step solution

Statement (I): The dipole moment of chloromethanes decreases as the number of chlorine atoms increases due to the vector addition of individual bond moments. The experimental values are CH ₃ Cl ( 1.87 D) CH ₂ Cl ₂ ( 1.60 D) CHCl ₃ ( 1.04 D). This sequence is correct. Statement (II): The bond angle of group 16 hydrides decreases down the group. As the electronegativity of the central atom decreases, the bond pairs move further away from the central atom, decreasing the bond pair-bond pair repulsion. The correct orde