Predict the major product(s) and mechanism(s) for reaction between 2-bromobutane (sec-butyl bromide) and each of the reagents

Question:

Predict the major product(s) and mechanism(s) for reaction between 2-bromobutane (sec-butyl bromide) and each of the reagents in Problem 42.
(a) KCl in DMF
(b) KI in DMF
(c) KC1 in CH3NO2
(d) NH3 in CH3CH2OH
(e) NaOCH2CH3 in CH3CH2OH
(f) CH3CH2OH
(g) KOC(CH3)3 in (CH3)3COH
(h) (CH3)3P in CH3OH
(i) CH3C02H