The ketone shown is treated with LDA in THF at $-78^{\circ }$C (kinetic conditions). Which structure shown is the enolate formed mainly?

The ketone shown is 2-methylcyclohexanone. LDA is bulky and strong; at $-78^{\circ }$C it removes the more accessible proton from the less substituted alpha carbon (C6) faster than the hindered tertiary C2-H, giving the kinetic enolate with the less substituted C=C. The more substituted enolate is the thermodynamic enolate, which forms under equilibrating conditions.