Doubt from aldehyde ketone

Please help with this. Answer is 2.
I am confused why woukd Cn- attack I and nor co.

Help @Bhuvanitha_2020 @Achyut_2020 @Shwetanshu_2018

I think that it will attack I because it is unhindered and if it attacks carbonyl group it can also leave again as it also a good leaving

as there is no H+ so negative charge will again involve again and will displace CN

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Thanks a lot, makes sense @Achyut_2020