Problem- treatment of 2, 3, 3-triphenylpropionitrile with 1 equivalent of potassium amide (KNH2) in liquid ammonia followed by addition of benzyl chloride affords 2-benzyl-2, 3, 3-triphenylpropionitrile in 97% yield. Use of 2 eq. of potassium amide gives an 80% yield of 2, 3, 3-4tetraphenylbuyronitrile under the same conditions. Explain these results using resonance forms and a mechanism.
Please carry out what you can and illustrate your work so I can follow. Thanks