In the Wittig reaction,a phosphorus ylide adds to a ketone or aldehyde to yield an alkene.Write the complete stepwise mechanism for the Wittig reaction shown below.Show all intermediate structures and all electron flow with arrows. 
Definitions:
Vernier Calipers
A precision measuring instrument used to measure internal and external dimensions extremely accurately.
Dial Calipers
Precision measuring tools that use a calibrated dial to measure distances or thicknesses with high accuracy.
Rotors
Discs attached to the wheels of a vehicle that the brake pads press against to slow or stop the car, as part of the disc brake system.
Hub
The central part of a wheel that connects it to the axle, bearing the load and allowing it to rotate.
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