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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3sc106

Select the reactions that are autocatalytic.

A $N X_{2} + 3 H X_{2} 2 NH X_{3}$ over iron
BOxidation of oxalic acid by acidified $KMnO X_{4}$ , catalysed by the $Mn X^{2 +}$ formed
CHydrolysis of ethyl acetate in water, catalysed by the acetic acid formed
DHydrogenation of ethene over nickel

Answer: B, C

Autocatalysis means a product catalyses its own formation.

Mn X^{2 +}

catalyses the oxalic acid oxidation, and acetic acid catalyses ester hydrolysis. Fe and Ni are external solid catalysts.

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