[mana]

hi all
I have an alcohol which is dehydrated with H2SO4 and H2O with heat, I'm not sure which alcohol can produce the ethylene compound,
I think the second can produce tertiary carbocation and the elimination must occure in the ring but the second can produce ethylene am I right?

[clarkstill]

You should draw out the mechanism and products you expect from each elimination reaction.

As a side note, 'ethylene compound' is a misleading term, I think 'mono-substituted alkene' would be more clear.