A. Action of water on calcium carbide
CaC2+2H2O→C2H2+Ca(OH)2
B. CH3CH2OHAl2O3−−−→CH2=CH2+H2O
C. CH3COONa+NaOH→CH4+Na2CO3
D. Saturated hydrocarbons are compounds containing only C-C single bond, here alkanes.
E. Unaturated hydrocarbons are compounds containing only C-C double or triple bond, here alkenes and alkynes.