A) कोबाल्टोसीन
B) रूथेनोसीन
C) ग्रिग्नार्ड अभिकर्मक
D) फेरोसीन
सही उत्तर: B
अधिक स्थिर क्योंकि ऋणात्मक आवेश इलेक्ट्रॉन आकर्षी समूह के निकट है
∵ आगमन नाभिकसमान उसी ‘C’ पर समाप्त होता है जिस पर ‘Br’ (विलोपन समूह) उपस्थित था
$ \therefore $ साइन प्रतिस्थापन नहीं है।
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