The correct increasing order of C–H(A), C–O(B), C=O(C) and C≡N(D) bonds in terms of covalent bond length is :

Given below are two statements :

Statement I : The correct order in terms of atomic/ionic radii is Al > Mg > Mg²⁺ > Al³⁺.

Statement II : The correct order in terms of the magnitude of electron gain enthalpy is Cl > Br > S > O.

In the light of the above statements, choose the correct answer from the options given below :

Consider the following data :

$\Delta_{f}H^{\circ}$ (methane, g) = $-X \; \text{kJ mol}^{-1}$

Enthalpy of sublimation of graphite = $Y \; \text{kJ mol}^{-1}$

Dissociation enthalpy of $H_2 = Z \; \text{kJ mol}^{-1}$

The bond enthalpy of C–H bond is given by :