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Question

Consider the following two reactions:
(i) Propene + H2 Propane; ΔH1
(ii) Cyclopropane + H2 Propane; ΔH2
Then, |ΔH2 - ΔH1| will be:

A
0
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B
|2BECCBEC=C|
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C
BEC=C
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D
|2BEC=CBECC|
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Solution

The correct option is B |2BECCBEC=C|
(i) CH3CH=CH2+H2CH3CH2CH3;

ΔH1=(BEC=C+BECC+6BECH+BEHH)(8BECH+2BECC)

(ii) C3H6+CH2CH3CH2CH3;

ΔH2=(3BECC+6BECH+BEHH)(8BECH+2BECC)

So,
ΔH2ΔH1=2BECCBEC=C

So, the correct option is B.

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