Question #185fb

Step 1. Draw the bond-line structure of the molecule.

We see immediately that the longest continuous chain has 7 carbon atoms.

The correct name is 1-choro-3,5-dimethylheptane.

Step 2. Convert it to a wedge-dash structure at #"C-3"# and #"C-4"#.

Step 3. Identify the groups on #"C-3"# and #"C-4"#.

The main chain of hexane is the horizontal zig-zag line of carbon atoms.

#"C-1"# is on the right.

The groups on #"C-3"# are #"H"#, #"CH"_3# and #"CH"_2"CH"_2"Cl"#.

Those on #"C-4"# are #"H"#, #"H"#, and #"CH"("CH"_3)"CH"_2"CH"_3#.

Step 4. Draw a template for a Newman projection.

Step 5. Attach the groups to the carbons of your template.

View the molecule from the upper left.

The groups on #"C-4"# go on the front carbon atom. Put the #"CH"("CH"_3)"CH"_2"CH"_3#. group on the bottom. The two #"H"# atoms go on the other bonds.

The groups on #"C-3"# go on the back carbon. The bulky #"CH"_2"CH"_2"Cl"# group goes on the top. The #"CH"_3# group and the #"H"# atom go on the other bonds.

This is the most stable conformer, because it has the bulky 2-chloroethyl and sec-butyl groups anti to each other.