MCQ
Raffinose is
- ✓Trisaccharide
- BMonosaccharide
- CDisaccharide
- DNone of these
${C_{18}}{H_{32}}{O_{16}} + {H_2}O \to \mathop {{C_6}{H_{12}}{O_6}}\limits_{{\rm{D\, glucose}}} + \mathop {{C_6}{H_{12}}{O_6}}\limits_{{\rm{D \,fructose}}} + \mathop {{C_6}{H_{12}}{O_6}}\limits_{{\rm{D\,mannose}}} $
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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,