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Choose the reaction in which $∆ H$ is not equal to $∆ U$

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$C_{(g r)} + O_{2 (g)} \to {CO}_{2 (g)}$

$C_{2} H_{4 (g)} + H_{2 (g)} \to C_{2} H_{6 (g)}$

$2 C_{(g r)} + H_{2 (g)} \to C_{2} H_{2 (g)}$

$H_{2 (g)} + I_{2 (g)} \to 2 H I_{(g)}$

answer is B.

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Detailed Solution

$\begin{array}{l} Δ H = Δ U + Δ n R T \\ When Δ n_{g} = 0 then Δ H = ∆ U \end{array}$

For (a) , $Δ n_{g} = 0$

${(B)Δn}_{g} = 1 \cdot 2 = - 1 (C) {Δn}_{g} = 0 (D) {Δn}_{g} = 2 - 2 = 0 (E) {An}_{g} = 2 - 2 = 0$

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