Цепь:
CH3-CH2-CH=CHCl+HCl(водный-раствор)-->X
X+NaOH(водный-раствор)--->Υ

CH3-CH=CH2 + HCl = CH3-CHCl-CH3

CH3-CHCl-CH3 +NaOH= CH3-CHOH-CH3 + NаCl