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 Form 4 Chemistry Organic Chemistry II Questions and Answers

(a)The following equations represents two different types of reactions
(i)#nC_4H8_((g)#→(#C_4H_8)n# (s)
(ii)# C_2H_6 (g)# +#Cl_2# (g)#overset(U.V)(rightarrow)##C_2H_5Cl# (l)+ HCl (g)
State the type of reaction represented by: (i) and (ii).
(b)The fermentation of glucose produces ethanol as shown in the equation below:
#C_6H_12O_6# (g)#overset(yeast)(->)# 2#CH_3CH_2OH# (aq) +2#CO_2 #(g)
This process produces about 10% ethanol by volume.
(i)State how the concentration of ethanol produced could be increased.
(ii)State and explain the observation that would be made when a piece of sodium metal is added to a sample of ethanol contained in a beaker.
(iii)Give two commercial uses of ethanol other in the manufacture of alcohol drinks.
(c) The molecular formula of a hydrocarbon is #C_6H_14#. The hydrocarbon can be converted into two other hydrocarbons as shown by the equation below.
#C_6H_14->#X+#C_3H_8#
(i)Name and draw the possible structural formula of X.

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