Question

Match List-I with List-II :  

List - IMolecule	List - IIBond enthalpy (kJ mol-1)
(A) HCl	(I) 435.8
(B) N2	(II) 498
(C) H2	(III) 946.0
(D) O2	(IV) 431.0

Identify the correct answer from the options given below :

• A. A-III, B-IV, C-I, D-II
• B. A-IV, B-I, C-III, D-II
• C. A-IV, B-III, C-II, D-I
• D. A-IV, B-III, C-I, D-II

Answer 1

The Correct Option is D

Bond enthalpy is defined as the energy needed to break one mole of a specific bond in a gaseous compound.
A. HCl: The H-Cl bond enthalpy is approximately 431 kJ mol$^{-1}$. This value is slightly lower than HBr but higher than HF, reflecting periodic trends within the halogen group. Therefore, A corresponds to IV.
B. N$_2$: The N≡N triple bond is exceptionally strong, possessing a bond enthalpy of approximately 946 kJ mol$^{-1}$. Thus, B matches with III.
C. H$_2$: The H-H single bond has a bond enthalpy of approximately 436 kJ mol$^{-1}$. Consequently, C is paired with I.
D. O$_2$: The O=O double bond exhibits a bond enthalpy of approximately 498 kJ mol$^{-1}$. Therefore, D is associated with II.
The resulting correct matching is A-IV, B-III, C-I, D-II.