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QUESTION

# How do you draw a Newman projection for hexane while sighting down C_2-C_3?

You follow a series of steps.

Step 1. Draw the structure of hexane.

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

Step 3. Identify the groups on "C-2" and "C-3".

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

"C-1" is on the left.

The groups on "C-2" are "H", "H", and "CH"_3.

Those on "C-3" are "H", "H", and "CH"_3"CH"_2"CH"_2.

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-2" go on the front carbon atom. Put the "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"_3"CH"_2"CH"_2 group goes on the top, and the two "H" atoms go on the other bonds.

This is the most stable conformer, because it has the bulky methyl and propyl groups anti to each other.