ISSUE:

Hello "organic".
I would like to know the products resulting from these reactions: a) phenylacetaldehyde + 2,4-dinitroaniline (in a basic medium)
b) cycloheptanone + Ph ₃ P=C(CH ₃ ) ₂ (in a neutral medium)
c) 2,4-pentanedione + 2 equivalents of magnesium butyl bromide (and treatment with a dilute hydrochloric acid solution at the end)

The b) I think would result: Ph ₃ P=O + 1-isopropylidenecycloheptane. The rest I don't know very well how to even approach them.