I know this is the worst image in the world. My only question - why is the Z con

Question

I know this is the worst image in the world. My only question - why is the Z conformation minor? Is it because of steric hinderence? If so, is that the only thing I have to look for? (Which one has the largest groups farthest apart)? Is that the only rule?

Thanks

slow step fast CH3CH2 CH3CH CHCH3 CH CH CHCH CH bond heterolysis H2O: HLO OH H ,CH bond CH1 mm CH rotation CH3CH O -H30 -H30 -H30 CH CH CH HE CH3CH H H H CH 1-butene (Z)-2-butene (E)-2-butene (minor product) (minor product) (major product)

Explanation / Answer

In general trans isomer is more stable than cis isomer. Hence, trans isomer is major product. When R groups are on opposite side of double bond, the steric interactions are reduced.

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