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JEEMAIN and NEET
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JEEMAIN PAST PAPERS
>>
2003
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Q)
If at 298 K the bond energies of
C
−
H
,
C
−
C
,
C
=
C
and
H
−
H
bonds are respectively
414
,
347
,
615
and
435
k
J
m
o
l
−
1
, the value of enthalpy change for the reaction <br>
H
2
C
=
C
H
2
(
g
)
+
H
2
(
g
)
→
H
3
C
−
C
H
3
(
g
)
at 298 K will be :
( A )
+
125
k
J
( B )
−
125
k
J
( C )
+
250
k
J
( D )
−
250
k
J
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