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 kJ/mol, the value of enthalpy change for the reaction
H₂C = CH₂(g) + H₂(g) H₃C - CH₃(g) at 298 K will be :
JEE Main 2003 · Annual, Paper 1 · Q2332