classify the mechanism as a substitution elimination or addition reaction

Question 1

Classify the mechanism as a substitution, elimination, or addition reaction.

Question 2

Question 3

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

Answer- Addition 

As H2 is added to alkene thus its a addition reaction 

Answer to question 3

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