Q8 of 27 Page 1

(a) Justify the role of tert - butyl peroxide in the polymerization of ethene.

(b) Write the structures of the monomers of the following polymer:


(a) Tertiary butyl peroxide acts as the catalyst in the polymerization.

It initiates the generation of free - radicals necessary for the polymerization process.


(b) CH2 = CH - CH = CH2 and C6H5 - CH = CH2


Explanation:


The addition reaction to form Buna - S is shown here. In this reaction, 1,3 - Butadiene and Styrene undergo addition polymerization to form Buna - S.


An addition polymerisation reaction is one in which monomers having double and triple bonds are repeatedly added.


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6

Calculate the freezing point of a solution containing 8.1 g of HBr in 100 g of water, assuming the acid to be 90 % ionized. [Given: Molar mass Br = 80 g/mol, Kf water = 1.86 K kg / mol]

OR


Calculate the molality of ethanol solution in which the mole fraction of water is 0.88.

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Identify the reaction and write the IUPAC name of the product formed:

(a)


(b)


OR


Write the structures and IUPAC names of the cross aldol condensation products only of ethanal and propanal

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Write the mechanism of acid dehydration of ethanol to yield ethane

 10

For a certain chemical reaction variation in concentration [A] vs. time (s) plot is given below:

(i) Predict the order of the given reaction?


(ii) What does the slope of the line and intercept indicate?


(iii) What is the unit of rate constant k?