NEET Solved Paper 2017 Question 39
Question: Identify A and predict the type of reaction

Options:
A) Cobaltocene 
B) Ruthenocene 
C) Grignard’s reagent 
D) Ferrocene 
Show Answer
Answer:
Correct Answer: B
Solution:

More stable as -ve charge is close to electron withdrawing group
∵ Incoming nucleophile ends on same ‘C’ on which ‘Br’ (Leaving group) was present
$ \therefore $ NOT cine substitution.