Select all combinations in which the substrate, reagent and major product are correctly matched.

2-Bromobutane gives the Saytzeff alkene but-2-ene, and the quaternary ammonium hydroxide gives the Hofmann alkene pent-1-ene. 1-Bromo-1-methylcyclohexane with ethoxide gives the trisubstituted endocyclic alkene 1-methylcyclohexene. The third pair is impossible: in 3-bromo-3-methylpentane, C-3 is attached to C-2, C-4 and the methyl group, so the double bond can only be 3-methylpent-2-ene or 2-ethylbut-1-ene, and 3-methylpent-1-ene cannot form.