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Dinesh khalmaniya 1 Best Answer
Meaning is that, in first mechanism, two times group ka transfer hua he or each time inversion hota he to job position first me thi vhi para pr rhegi mean no change. Check the below mechanism with marked carbon.
shweta, mechanism ko smjhne k liye ap allylic carbon ko mark kro or dekho ki para pr konsa carbon attached ho rha he. apko mechanism apne aap smjh me aa jayegi
see the mechanism