Match the orbital overlap figures shown in List-I with the description given in List-II and select the correct answer using the code given below the lists.
List-I
P. (see structure)
Q. (see structure)
R. (see structure)
S. (see structure)
List-II
p−dπ antibonding
d−dσ bonding
p−dπ bonding
d−dσ antibonding
Codes:
P
Q
R
S
(A)
2
1
3
4
(B)
4
3
1
2
(C)
2
3
1
4
(D)
4
1
3
2
PRS
(A)P-2, Q-1, R-3, S-4
(B)P-4, Q-3, R-1, S-2
(C)P-2, Q-3, R-1, S-4✓ Correct
(D)P-4, Q-1, R-3, S-2
Answer: (C)
Solution
Analyzing the orbital overlap diagrams:
P: Shows d-d overlap along the internuclear axis with lobes pointing away from each other → d−dσ bonding → P matches 2
Q: Shows p-d overlap perpendicular to the axis with same phase → p−dπ bonding → Q matches 3
R: Shows p-d overlap perpendicular to the axis with opposite phases → p−dπ antibonding → R matches 1
S: Shows d-d overlap along the axis with opposite phases (node between) → d−dσ antibonding → S matches 4
Therefore, the correct matching is P-2, Q-3, R-1, S-4, which corresponds to option (C).
JEE Advanced · 2014 · 25 May 2014 · Paper 2 · Single correct option
