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Match the expressions in List-I with the correct quantity in List-II. List-I (A) psi(MO) = psi(A) - psi(B) (B) mu = Q * r (C) (Nb - Na)/2 (D) psi(MO) = psi(A) + psi(B) List-II (I) Dipole moment (II) Bonding molecular orbital (III) Anti-bonding molecular orbital (IV) Bond order Select the correct matching:

1. (A)-(II), (B)-(I), (C)-(IV), (D)-(III)
2. (A)-(III), (B)-(IV), (C)-(I), (D)-(II)
3. (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
4. (A)-(III), (B)-(IV), (C)-(II), (D)-(I)

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

Solution

Destructive combination psi(A)-psi(B) is the antibonding MO (III), additive psi(A)+psi(B) is the bonding MO (II), mu = Q*r is dipole moment (I), and (Nb-Na)/2 is bond order (IV).

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