For the gas-phase reaction

CHEMISTRY · Single correct · A Level · Chemistry · Introduction to organic chemistry · Introduction to organic chemistry

Problem

For the gas-phase reaction ClO+NO→Cl+NO2\text{ClO} + \text{NO} \rightarrow \text{Cl} + \text{NO}_2, a mechanism must be written that satisfies two constraints: • Every elementary step must be bimolecular. • NO must act as a catalyst, appearing unchanged in the net equation. Which of the following elementary steps would violate at least one of these constraints if included in the mechanism? (a) 2 ClO→Cl2+O22\,\text{ClO} \rightarrow \text{Cl}_2 + \text{O}_2 (b) ClNO2→Cl+NO2\text{ClNO}_2 \rightarrow \text{Cl} + \text{NO}_2 (c) ClO+NO→ClNO2\text{ClO} + \text{NO} \rightarrow \text{ClNO}_2 (d) ClNO+ClO→2 Cl+NO2\text{ClNO} + \text{ClO} \rightarrow 2\,\text{Cl} + \text{NO}_2

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