) For the given reactien, two possible chaices for writing electron pushing mechanism are
provided Circle the option which you think is accurate. Explain the reasan far your choice 1.5*2-
3 points) A) bl For the given reaction, two possible chaices for writing electron pushing
mechanism are provided Circle the option which yau think is accurate. Explain the reason far
your cheice CEN: N: N: CEN: 4) There is resonance, sothink.errors in Resonance based arrows
1X3-3 points) a) b) CH
Solution
(A)
(A.) This electron movement is correct as shown in the figure. As we know that double bond of
the alkene serves as electron cloud so electrons of double bond will abstract proton from HCl
which subsequently forms a bond leading to positive charge on the quaternary carbon. After
abstraction, chloride ion will remain as such.
(B) As we know that Carbonyl is a polar group as carbon is slightly electropositive and oxygen
of carbonyl is slightly electronegative in nature. Cyanide ion bearing negative charge will
subsequently attack carbonyl carbon leading to the development of negative charge on the
oxygen.
4. Yes, there is errors in resonance errors.
(A)
The electron movement will be like this as the negative charge present on the oxygen will first
forms a double bond which eventually led to the negative charge on the another oxygen.
(B)
The electron movement will be that lone pairs of nitrogen forms a double bond in the ring
leading to the development of positive charge on the nitrogen.
(C)

The cyanide ion attack the positively charged oxygen and the electron of the double bond were
transferred to the carbon leading to the negative charge.