Give a reason why each of the following names are incorrect by the IUPAC system and give a correct IUPAC name.
(a) 2-ethyl-3-methylpentane
(b) 2,5-dimethyl-4-hexene
(c) 1-chlorobutanal
(d) 1,3-dichloro-5-phenol
(e) Methyl propanoate as the name of the product of the reaction between ethanol and ethanoic acid.