Question

What is the most stable form of the following compounds? (i.e., draw the most stable form in chair form of both the compounds)

Answer 1

Draw in crayon....?

Explanation:

Just to retire this question...you really should have a set of molecular models to address the problem... We know that bulky atoms or groups have unfavourable `"1,3-trans-diaxial"` interactions. And so which isomer has the LEAST trans-axial interaction? I don't know. And I still won't know until I make the models...so have at it....

Answer 2

Here's what I get.

Explanation:

Part (a)

I have oriented the chair forms below so that `"C1"` is on the right and `"C2"` and `"C3"` are in the front.

The two chair forms are

and

The more stable chair has more of the bulky groups in the equatorial positions.

Chair 1 has two equatorial chlorine atoms, and Chair 2 has four.

Chair 2 is the more stable form.

Part (b)

The chair forms are

and

Chair 3 has one equatorial chlorine atom, and Chair 4 has five.

Chair 4 is the more stable form.