Conformational analysis of butane | Organic chemistry | Khan Academy

[@claricea5353]

What's the difference between steric and torsional strain?

[@5Youssif]

torsional is usually from the electron repulsion

[@irfanaasif2149]

Steric strain is the repulsion between bulkier groups attached to the carbon. When bulky groups are close to each other, they do not have space to turn. Torsional strain is caused by the repulsive forces between electron in bonds that do not shared atoms.

[@sagestation7831]

Cyclic compounds experience torsion strain due to Gauche and eclipsed conformations. Since they are unlike freely moving molecules such as those with single bonds, when they "rotate" it twists the whole conformation causing strain. Make a model with sticks and balls of cyclohexane and try twisting it

[@nataliejennings8728]

he doesn't explain how you know how much energy one uses or does not. can somebody explain how you calculate?

[@nataliejennings8728]

Like he says H eclipsed to another H equals 4kJ/mol but how is that determined?

[@chamodperera4125]

@@nataliejennings8728 those are either experimentally or computationally calculated values. the presenter uses those calculated values to clearly explain the geometrical states.