Q.

Calculate the enthalpy change for the isomerization reaction as given :

CH2=CHCH2CH(A)=CHCH=CH2NaNH2ΔCH2=CHCH(B)=CHCH=CHCH3

Use the following data :

ΔHfC2H4=2275.5kJ/mol

ΔHfC2H6=2839.2kJ/mol

Resonance energy of A = 50 kJ/mol 

Resonance energy of B = 70 kJ/mol

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a

-20,000 J/mol

b

-1622.6 kJ/mol

c

-1642.6 kJ/mol

d

-1692.6 kJ/mol

answer is D.

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Detailed Solution

Given data is,

ΔHfC2H4=2275.5kJ/mol

ΔHfC2H6=2839.2kJ/mol

Resonance energy of A = 50 kJ/mol 

Resonance energy of B = 70 kJ/mol
The enthalpy change for the isomerization reaction -20,000 J/mol for the given reaction.

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