please answer all, thanks!

The following names are incorrect by IUPAC rules. Determine the correct IUPAC name for each compound. (a) 2,2-Dimethyl-3-butene (b) 4-Methyl-2,4-pentadiene (c) 2-Methyl-2-cyclobutene (d) 3-Methyl-1,3-cyclopentadiene How many hydrogen atoms are present in a molecule of each of the compounds: (a) methane (b) 1,3-hexadiene (c) 3-ethylpentane (d) 2,3-dimethylhexane How many carbon atoms are present in each of the following unsaturated hydrocarbons? (a) (6) (c) (d)