MCQ
The reagent used in Gatterman Koch aldehyde synthesis is
- A$Pb/BaS{O_4}$
- Balkaline $KMn{O_4}$
- Cacidic $KMn{O_4}$
- ✓$CO + HCl$

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$O\left( g \right) + {e^ - } \to O_{\left( g \right)}^ - \,\,\,\,;\,\,\,\,{\Delta _f}{H^\Theta } = - 141\,kJ\,mo{l^{ - 1}}$
${O^ - }\left( g \right) + {e^ - } \to O_{\left( g \right)}^{2 - }\,\,\,\,;\,\,\,\,{\Delta _f}{H^\Theta } = + 780\,kJ\,mo{l^{ - 1}}$
Thus process of formation of $O_2^-$ in gas phase is unfavourable even thought $O_2^-$ is isoelectronic with neon. It is due to the fact that,
(Round off to the Nearest Integer).
[Given : Atomic masses : $H : 1.0 \,u , O : 16.0\, u ]$