Write the structural formulas a) 2,3-dimethylpentane b) 2-methylbutene c) 2-methylbutadione-1,3

Write the structural formulas a) 2,3-dimethylpentane b) 2-methylbutene c) 2-methylbutadione-1,3 g) 4,4 dimethylpentine-2 e) 2,3-dimethylbutanol-2 f) 2,2,3-trimethylpentanol -2 g) 2,4,4-trimethylhexanoic acid

a) 2,3-dimethylpentane – a chain of 5 carbon atoms (pentane) is built, then two methyl groups at 2 and 3 carbon atoms are added.
b) 2-methylbutene-1 – a chain of 4 carbon atoms (butane) is built, a methyl group is placed at the 2 atom, a double bond is placed after the first atom (according to the problem statement, the position of the double bond is not indicated, usually this implies a double bond at the first carbon atom ).
c) 2-methylbutadiol-1,3 – probably a typo in the assignment: you need to draw diol dihydric alcohol, not dioH.
d) 4.4 dimethylpentine-2 – draw pentin-2 and add two methyl groups at the 4th carbon atom.
e) 2,3-dimethylbutanol-2 – butane is being built, at 2 atoms we draw OH groups, at 2 and 3 atoms – methyl groups.
f) 2,3,3-trimethylpentanol-2 – probably again a mistake. The second carbon atom cannot have two methyl groups, as required by that condition, then the atom will become pentavalent, which is impossible. Perhaps three methyl groups will be located as shown in the figure.
g) 2,4,4-trimethylhexanoic acid – we depict 6 carbon atoms, transform the extreme atom into a carboxylic acid, arrange the methyl groups, considering the carboxyl atom as the first carbon atom.