What is a correct mechanistic step observed for the following transformation? i Cat.H2SO4 HO OH ОН ОН A о С НО но ТУ

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Could I get help with all 3 please?
What is a correct mechanistic step observed for the following transformation? i Cat.H2SO4 HO OH

ОН ОН A о С НО но ТУ

What is the IUPAC name of this compound? CHO a) 3-Isopropyl-2-propenaldehyde c) (2Z) - 4-isopropyl-2-propenal

b) Trans-3-isopropy-2- butenal d) (2E) - 4-Methylpent-2-enal

Provide the missing reagents in the following transformation. Ph,P Bul. 2 PhFC CHOh 1 А) 1 PhCHO 2 PhCHCI B) 1 Ph.CO 2 PHCHC C) 1 PhCH.C 2 PACHO D) 1 PhCH.CH Photo