Organometallic Compounds MCQs for CSIR NET and GATE PDF Download

Organometallic Compounds Assignment 5
MCQs for CSIR NET & GATE

Organometallic Compounds in Chemistry holds a lot of weightage in competitive exams such as CSIR NET exam for chemical sciences and GATE Chemistry exam. In this artical, we will be looking at some of the multiple choice questions (MCQ) asked in previous year exams. 

You can solve the mcqs online and match the answers from the answer key or try the questions as a quiz and calculate your marks. You can also download the assignment as a PDF file from google drive to make it available offline and solve later. Good Luck!

    

Questions

Question 1. In the complex Me₂Al₂ (μ-Me)₂, the two alkyl acts as bridging ligands. This seems to happen by 3c-2e^- bond involving between metal and alkyl carbon.
The hapticity of terminal and bridging alkyl groups, are, respectively:
a) η¹, η² 
b) η², η¹ 
c) η², η² 
d) η¹, η¹ 

Question 2. Find out the bonding molecular orbitals in [Rh₆ (CO)₁₆] and [Os₅C(CO)₁₅] respectively:
a) 86 and 74
b) 43 and 37
c) 84 and 72
d) 43 and 32

Question 3. The no. of ¹H-NMR signals at room temperature and 260 K respectively are:

a) 2, 5
b) 2, 3
c) 3, 7
d) 3, 5

Question 4. Consider the following reactions: 

The reaction which will produce methane as a product is/are?
a) Q only
b) P and Q
c) Q, R
d) P, Q and R

Question 5. The total no. of framework electrons present in the following fragments respectively, are:
Ni(CO)₂, Cr(CO)₄, CpCr(CO)₂
a) 3, 2, 2
b) 2, 2, 3
c) 3, 2, 3
d) 2, 2, 2

Question 6. Which of the following statements is not correct?
a) CO, NO is both a σ donor and a π acceptor
b) NO⁺ is isoelectronic with CO
c) NO is isoelectronic with CO
d) The bent coordination mode of NO arises formally from NO^-

Question 7. The rate determining step in oxo-process and Monsanto Acetic Acid process, respectively, are:
a) dissociation of CO; oxidative addition of CH₃I
b) Coordination of olefin; oxidative addition of CH₃I
c) dissociation of CO; alkyl migration
d) Coordination of olefin; alkyl migration.

Question 8. Match the following with their relative rates of hydrogenation using Wilkinson’s catalyst at 25^oC:

a) P-II, Q-I, R-III
b) P-I, Q-II, R-III
c) P-II, Q-III, R-I
d) P-I, Q-III, R-II 

Question 9. Which of the following is not formed at any stage of the reaction:

given that:
v_CO = 1961, 1942, 1790 cm^-1 for (n⁵-C₅H₅)₂ Fe₂ (CO)4 

Question 10. Classify the following boranes by structural type
C₂B₉H₁₂^-, SB₉H₁₁, CPB₁₀H₁₁ respectively
a) nido, closo, nido
b) nido, nido, nido
c) nido, nido, closo
d) arachno, closo, nido

Question 11. Match the following zintl ions with their cluster types: 

a) A-Q, B-R, C-P
b) A-R, B-Q, C-P
c) A-P, B-Q, C-R
d) A-R, B-P, C-Q

Question 12. The major product of the following reaction is:

Question 13. The product P in the reaction given below is

Question 14. Match the following with their chemical shifts:

a) A-II, B-I, C-III
b) A-I, B-II, C-III
c) A-III, B-II, C-I
d) A-II, B-III, C-I

Question 15. Calculate the bond order of [Re₂C_l4(PMe₂Ph)₄]²⁺
a) 2.5
b) 3.5
c) 4
d) 3

Question 16. Which of the following is not isolobal with CH?
a) CpNi
b) CH₂⁺
c) [Ni(CO)₃]⁺
d) CH₂^-

Question 17. The final product of the following reaction is?

a) ester 

b) aldehyde 

c) diketone

d) ketone

Question 18. For a hypothetical molecule, Mo(CO)₄ (PMe₃)₂ the no. of IR active CO bands are: (Assume D_4h geometry) 
a) 1
b) 2
c) 3
d) 4

Question 19. Identify the most likely second-row transition metal for [M(CO)₃(NO)]^- and [M(PF₃)₂ (NO)₂]⁺ respectively given that the second complex contains linear M-N-O
a) Ni, Co
b) Fe, Co
c) Ru, Rh 
d) Ru, Ir 

Question 20. Match the following complexes with their relative rates of reductive elimination.

a) A-P, C-R, B-Q
b) A-R, C-Q, B-P
c) A-P, C-Q, B-R
d) A-R, C-P, B-Q

Answers

1.d 2.b 3.b 4.d 5.b 6.c 7.b 8.a 9.c 10.c 11.b 12.c 13.c 14.a 15.c 16.d 17.b 18.a 19.c 20.c