$(1)$ What are the possible reaction products when heating ethanol in the presence of

sulphuric acid

$(2)$ Give the reaction equation for the 'best' method for preparingCH$3$OCH$2$CH$3$

$(3)$ Which reaction products are formed when reacting:

a$.2-$chloro$-2-$methylpentane with methanol

b$.2-$methyl$-1-$pentene with methanol $($acid medium$)$

c$.2-$methyl$-2-$pentene with methanol $($acid medium$)$

d$.$ ethyne with methanol

$(4)$If reaction occurs, give the equation for the reaction of ethylene oxide with

a$.$ concentrated sulfuric acid

b$.1$ mole of HCl

c$.$ excess HCl

d$.$ H$2$O $/$ H$2$SO$4$

e$.$ H$2$O $/$ NaOH

f$.$ After

g$.$ CH$3$CH$2$OH $/$ H$2$SO$4$

h$.$ NH$3,$ excess$/$undersize

i$.$ CH$3$Br$/$Mg$,$ followed by water

j$.$ CH$3$Br$/$Li$,$ followed by water

k$.$ ethyne$/$sodium amide, followed by water