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Q.

Enthalpy of polymerization of ethylene. as represented by the reaction

 nCH2=CH2⟶−CH2−CH2−n is −100kJ Per mole of ethylene. Given bond enthalpy of C=C  bond is 600 kJ mol-1, enthalpy of C-C bond (in kJ ) will be :

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a

700

b

indeterminate

c

350

d

116. 7

answer is B.

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Detailed Solution

Every mole of ethylene contains two single bonds when it is polymerized completely.

ΔHpolymerisation =ΔHCH2=CH2−2ΔHCH2−CH2

2ΔHCH2−CH2=600−(−100)=700kJmol−1

2ΔHCH2−CH2=7002=350kJmol−1

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