Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main 20236 AprilEvening Shift
Exam
JEE Main
Year
2023
Date
6 April
Shift
Evening Shift
Subject
Chemistry
Chapter
Coordination Compounds

JEE Main 2023 · 6 April · Evening Shift · Chemistry · Coordination Compounds

Given below are two statements: one is labelled as “Assertion...

Given below are two statements: one is labelled as “Assertion A” and the other is labelled as “Reason R”

Assertion A : In the complex Ni(CO)4Ni ( CO{)}_{4} and Fe(CO)5Fe ( CO{)}_{5}, the metals have zero oxidation state.

Reason R : Low oxidation states are found when a complex has ligands capable of π\pi-donor character in addition to the σ\sigma-bonding.

In the light of the above statements, choose the most appropriate answer from the options given below

Options

  1. AA is correct but R is not correct
  2. BA is not correct but R is correct
  3. CBoth A and R are correct but R is NOT the correct explanation of A
  4. DBoth A and R are correct and R is the correct explanation of A

Correct answer

A. A is correct but R is not correct

Step-by-step solution

The ligand carbon monoxide has no charge, hence metals have zero oxidation state in both Ni(CO)4Ni ( CO{)}_{4} and Fe(CO)5Fe ( CO{)}_{5}. Low oxidation states are found when a complex has ligands capable of π\pi-acceptor character in addition to the σ\sigma-bonding.

In the complexes, Ni(CO)4 and Fe(CO)5Ni{\left(CO\right)}_{4} \text{ and } Fe{\left(CO\right)}_{5}, the ligand COCO is π−\pi -acceptor character in addition to the σ−bonding\sigma - bonding.

Practice Coordination Compounds on Quantrex Academy →

More from Coordination Compounds

Reaction of PtF_6 with oxygen ( O_2 ) gas results in the formation of an ionic compound… JEE Advanced 2026The total number of all possible isomers for the square planar complex with formula… JEE Advanced 2026Consider that the coordinating atoms of the ligands in cis -[Co(NH _3 ) _4 Cl _2 ]Cl and… JEE Advanced 2026Number of paramagnetic complexes among the following is ________. [MnBr_4]^ 2… JEE Main 2026Which of the following sequences of hybridisation, geometry and magnetic nature are… JEE Main 2026An excess of AgNO _3 is added to 100 mL of a 0.05 M solution of… JEE Main 2026Match the LIST-I with LIST-II List-I Electronic configuration of tetrahedral metal ion… JEE Main 2026Which of the following are true about the energy of the given d-orbitals of a tetrahedral… JEE Main 2026 Full Coordination Compounds list All JEE Main PYQs