Question

Which of the following reaction is auto catalytic?

• A. $C _{6} H _{5} COCl + C _{6} H _{6} \xrightarrow {Al Cl _{3}} C _{6} H _{6} COC _{6} H _{6}+ HCl + AlCl _{3}$
• B. $4 NH _{3}+5 O _{2} \xrightarrow {p t} 4 NO +6 H _{2} O$
• C. $CH _{2}= CH _{2}+ H _{2} \xrightarrow {\left[ Rh Cl \left( PPh _{3}\right)_{3}\right]} CH _{3}- CH _{3}$
• D. $5 C _{2} O _{4}^{2-}+2 MnO _{4}^{-}+16 H ^{+} \rightarrow 10 C _{2}+2 Mn ^{2+}+8 H _{2} O$

Answer 1

Answer: (D)

Auto catalyst is a chemical reaction in which, if one of reaction products is also act as a catalyst for the same or coupled reaction. In the given reaction (s).
$5 C _{2} O _{4}{ }^{2-}+2 MnO _{4}{ }^{-}+16 H ^{+} \rightarrow 10 CO _{2}+2 Mn ^{2+}+8 H _{2} O$
is an example of all to catalyst where, $M n^{2+}$ ions act as an auto catalyst.