Nomenclature for organic compounds

What would be the IUPAC name for the following compound?

• N,N-diethyl-3-secbutyloctan-4-amine

• N,N-diethyl-5-secbutyoctan-4-amine

• N,N,5-triethyl-6-methyloctan-4-amine

• 5-secbutyl-N,N-diethyloctan-4-amine

What would be the IUPAC name for the following compound?

• 3-cyano-2-hydroxypentanoic acid

• 4-hydroxy-3-nitrilepentanoic acid

• 3-cyano-4-hydroxypentanoic acid

• 3-cyano-2-olpentanoic acid

What would be the IUPAC name of the following compound?

• sec-butyl-2-isopropylpentanoate

• sec-butoxy-2-isopropylpentane

• 2-isopropylpentylsec-butanoate

• 2-isopropylpentoxysec-butane

What would be the IUPAC name for the following molecule?

• o-tert-butylbenzaldehyde

• m-tert-butylbenzaldehyde

• p-tert-butylbenzaldehyde

What would be the IUPAC name of the following molecule?

• 5-amino-4-ethyl-8-oxanona-4,6-dien-2-ol

• 5-amino-6-ethyl-8-hydroxynona-3,5-dien-2-one

• 4-ethyl-8-oxa-2-hydroxynona-4,6-dien-5-amine

• 5-amino-6-ethyl-8-hydroxynona-3,5-dien-2-al