I think the spell checker might have mangled your Q.
Trying to read between the mess, reduction won't lead to chiral carbons. If you reduce an aldehyde, you'll make a primary alcohol which won't be chiral. Reduction of a ketone will lead to a secondary alcohol, which could be chiral, except in this case, there are two CH3 groups attached to the central C, so no stereoisomerism.
The hydroxynitrile, on the other hand, is chiral and it is indeed a case that the CN- can attack from either side.