I need the structural formulas of these . When i say structural i dont need the drawings.

I will give an example. Seee how the structural formula is writen here , thats how i need my answers

2,3-dimethylpentanal Molecular formula C₇H₁₄O

Structural formula CH₃CH₂CH(CH₃)CH(CH₃)CHO

Theses are the ones i need ….. i think i have the molecular formula correct for the top ones but i need them for the bottom ones, I have indicated where i need answers by ???

Ethanal Molecular formula C₂H₄O

Structural formula ?????

1-bromo-2-chloropropanal Molecular formula C₃H₅ClO

Structural formula ????

‎

Pentanal Molecular formula C₅H₁₀O

Structural formula ????

Butanal Molecular formula C₄H₈O

Structural formula ????

Propanoic acid Molecular formula ????

Structural formula ????

2-chloro-2-methylbutanoic acid Molecular formula ???

Structural formula ???

Ethanoic acid Molecular formula ???

Structural formula ???

Pentanoic acid Molecular formula ???

Structural formula ???