# How do you draw ( S )-1-bromo-1-chlorobutane?

##### 1 Answer

#### Answer:

Here's how I do it.

#### Explanation:

**Step 1.** Draw the structure of 1-bromo-1-chlorobutane.

**Step 2.** To get the stereochemical structure, start with the structure of butane.

**Step 3.** At

**Step 4.** Put the

We have a 50:50 chance of getting it right. Here's one possibility.

**Step 5.** Assign priorities to the groups.

**Step 6.** Assign stereochemistry

Then

We got it right!

So this really is (

If we had gotten it wrong, we would have interchanged any two of the groups.

For example, in the diagram above, interchanging the