Classify the mechanism as a substitution, elimination, or addition reaction.
Answer to question 1
This tert-alkyl halide could form a stable tertiary carbonium ion, but under basic conditions that will not happen. Because of the chlorine’s steric hindrance, the hydroxide ion cannot approach. Instead, the hydroxide attacks a hydrogen on the less hindered beta carbon, with chloride elimination and creation of a double bond. The reaction conditions stabilize the partially negative transition state.
Answer to question 2
As H2 is added to alkene thus its a addition reaction
Answer to question 3