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H2C=CH2+H2Ni/3000C−−−−−C2H6 to get back the ethene, ethane must be:

A
dehydrogenated in the presence of Cu at 3000C
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B
heated to 4500C in the presence of HNO3 vapoar
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C
heated 1700C in the presence of conc. H2SO4
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D
heated to 7500C
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Solution

The correct option is C heated to 7500C
Alkanes formed from alkenes, can be reverted back to alkenes by catalytic cracking or thermal decomposition, when heated in the absence of air, gives a mixture of ethylene and hydrogen.
Cleavage of C-H bonds: This type of fission results in the formation of alkenes. It is catalyzed by the oxides of chromium, vanadium, molybdenum.

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