As the reaction progresses
and the bond between the incoming nucleophile and the carbon
atom starts forming, the bond between carbon atom and leaving
group weakens As this happens, the three carbon-hydrogen bonds
of the substrate start moving away from the attacking nucleophile In
transition state all the three C-H bonds are in the same plane and the
attacking and leaving nucleophiles are partially attached to the
carbon As the attacking nucleophile approaches closer to the carbon,
C-H bonds still keep on moving in the same direction till the attacking
nucleophile attaches to carbon and leaving group leaves the carbon