Write three different reactions showing oxidation of aldehydes

How many moles of oxygen react with 12 moles of aluminum

Ab c or d ? i’m not sure what the answer is

#7 how does the structure of amino acids allow them to form a polypeptide? each amino acid has an amino group and a carboxyl group. each amino acid has a hydrogen atom and a carboxyl group. each amino acid has a carboxyl group and an r group. each amino acid has an r group and a hydrogen atom.