- ✓${C_2}{H_5}OH$
- B$C{H_3} - O - C{H_3}$
- C${(C{H_3})_2}C = O$
- D$C{H_3}CHO$
Hydrogen bonding is observed when $H$ atom is attached to more electronegative $N , F$ or $O$ atom.
Thus, hydrogen bonding is possible in ethanol and triethylamine.
In ethanol, $H$ is attached to a more electronegative oxygen than in triethylamine, in which $H$ is attached to a less electronegative nitrogen.
Moreover, in triethyl amine, the $+ I$ effect of three methyl groups decreases the extent of hydrogen bonding.
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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,

(Atomic masses of $\mathrm{Ag}$ and $\mathrm{Cl}$ are $107.87$ and $35.5$ respectively)