[Agent-X]

Questions:
The last two molecules are tertiary, right?
Why is one greater? Is it the stereo-chemistry? Strain? What?

I'm not sure. I think it's stereochemistry. The book doesn't say.

--
E1 acid-catalyzed dehydration of 3,3-dimethyl-2-butanol alcohol with H2SO4 and heat gives these products and their percentages.

3%: 3,3-dimethyl-1-butene
64%: 2,3-dimethyl-2-butene
33%: 2,3-dimethyl-1-butene

[Hybrid]

always elimination rx go fro the synthesis of non-terminal alkenes. Zaitsev's rule

In elimination reactions the major product is the one in which the maximum number of substituents is attached to the doubly bonded carbons.