Match the properties given in list-I with the metals given in list-II

Choose the correct answer from the options given below:

(A)-(II), (B)-(I), (C)-(IV), (D)-(III)

The correct answer is Option (2) → (A)-(II), (B)-(I), (C)-(IV), (D)-(III)

(A) Element with highest second ionization enthalpy → (II) Cu
Copper has configuration 3d¹⁰ 4s¹. After losing one electron it becomes 3d¹⁰ (fully filled and very stable). Removing the second electron breaks this stability, so second ionization enthalpy is very high.

(B) Element with highest heat of atomisation → (I) Co
Cobalt has strong metal–metal bonding due to effective overlap of d-orbitals, giving high heat of atomisation among the given options.

(C) M in M(CO)₆ → (IV) Cr
Cr(CO)₆ (Chromium hexacarbonyl) is a well-known stable metal carbonyl compound.

(D) Element with highest third ionization enthalpy → (III) Zn
Zinc has configuration 3d¹⁰ 4s². After losing two electrons it becomes 3d¹⁰ (very stable). Removing the third electron requires breaking this filled d-subshell, so third ionization enthalpy is highest.