True. Elimination reactions are favored over substitution reactions when the nucleophile used is bulky and the substrate is a tertiary alkyl halide. This is because bulky nucleophiles have a harder time approaching the carbon center and displacing the leaving group in a substitution reaction. In contrast, elimination reactions involve the removal of a leaving group and the formation of a double bond, which requires less hindrance from the nucleophile. Tertiary alkyl halides also have more stable carbocation intermediates, which further promotes elimination over substitution.
