18) A correct name for the following compound would be which of those below? 0 a) 2,5-Dimethyl-6-hexanal b) 2,5-Dimethylhexanal c) 2-Aldehydoisohexane d) 3,5-Dimethylheptanone e) 1-Hydro-2,5-dimethyl-1-hexanone 19) What is the correct tructure for 2,5-dimethythexanal? IV a) 1 b) II c) II1 d)IV 20 correct name for CiHsCH,CH,CH is? a) 3-Benzylpropanone b) 3-Phenylpropanal c) 3-Benzylpropanal d) Nonanone e) Nonanal