The correct statement regarding terminal/bridging CO groups in solid Co₄(CO)₁₂ and Ir₄(CO)₁₂ is · ABC26IN0241
Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Organometallic Compounds – General · Exam: CSIR NET 2013 · Marks: 2 · Difficulty: Medium
The correct statement regarding terminal/bridging CO groups in solid $\mathrm{Co_4(CO)_{12}}$ and $\mathrm{Ir_4(CO)_{12}}$ is
(a)both have equal number of bridging CO groups
(b)number of bridging CO groups in $\mathrm{Co_4(CO)_{12}}$ is 4
(c)the number of terminal CO groups in $\mathrm{Co_4(CO)_{12}}$ is 8
(d)the number of bridging CO groups in $\mathrm{Ir_4(CO)_{12}}$ is zero.
Answer
Answer (as printed): D
Explanation
Due to increase in size of Ir, compared to Co, the Metal-Metal bond length also increases, thus the ability to form bridge carbonyl decreases with increase in M-M bond No of bridging CO= 3 No of bridging CO = 0 No of Terminal CO= 9 No of terminal CO =12 +
Explanation as extracted from the printed page; notation may be imperfect.