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Which of the following statement is incorrect

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Using Hess law bond enthalpies can be calculated.

In case of polyatomic molecules, bond dissociation enthalpy is different for different bonds within the same molecule

$Δ_{r} H^{\circ} = \sum$ (bond enthalpies (reactants) – $\sum$ bond enthalpies (products)
This relationship is valid when the substances in the reaction are in gaseous state.

All the 4 C-H bonds in methane are not identical in bond length.

answer is C.

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All the 4 C-H bonds in $C H_{4}$ are identical in bond length

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