Alkyl halides

Question 1

E1

Answer 1

Elimination first order via carbocation intermediate 3>2>1

Question 2

E2

Answer 2

Elimination first order, second order, 3>2>1

Question 3

SN1

Answer 3

Substitution, First order, via C+ intermediate. Chiral –> racemate, 3>2>1

Question 4

SN2

Answer 4

Second order, inversion of configuration at site of substitution, 1>2>3