The ketone shown is treated with one equivalent of LDA in THF at -78 ${}^{\circ }$C (kinetic control) and the enolate is then quenched with $\mathrm{CH}{}_3\mathrm{I}$. Which structure is the major product (ignore cis/trans)?

The drawn compound is 2-methylcyclohexanone. The bulky strong base LDA at low temperature removes the more accessible proton at the less substituted C6 (kinetic enolate); methylation there gives 2,6-dimethylcyclohexanone. Structure A comes from the more substituted (thermodynamic) enolate, C is O-methylation and D is over-alkylation.