Show, by writing an appropriate series of equations, how you could prepare propyne from each of the

Question:

Show, by writing an appropriate series of equations, how you could prepare propyne from each of the following compounds as starting materials, You may use any necessary organic or inorganic reagents.
(a) 2-Propanol
(d) 1, 1-Dichloroethane
(b) 1-Propanol
(e) Ethyl alcohol
(c) Isopropyl bromide