MCQ
On heating an aliphatic primary amine with chloroform and ethanolic potassium hydroxide, the organic compound formed is :
- Aan alkanol
- Ban alkanediol
- Can alkyl cyanide
- ✓an alkyl isocyanide
$R-\ddot{N}_{H_{2}}+C H C I_{3} \frac{C_{2} H_{5} O H}{K O H} R-_{N}^{+} \equiv \bar{c}^{:}$
$1^{\circ}\; amine \quad \quad \quad \quad \quad \;Alkyl \;isocyanide$
The mechanism of this reaction included rearrangement of nitrene in which migration of alkyl group from carbon to nitrogen takes place.
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| List $I$ (Substances) | List $II$ (Processes |
| $(A)$ Sulphuric acid | $(i)$ Haber's process |
| $(B)$ Steel | $(ii)$ Bessemer's process |
| $(C)$ Sodium hydroxide | $(iii)$ Leblanc process |
| $(D)$ Ammonia | $(iv)$ Contact process |
(Round off to the Nearest Integer) [Given : $R =8.314 \,J mol ^{-1} K ^{-1}$. Assume,
hydrogen is an ideal gas] [Atomic mass off $Fe$ is $55.85\, u$ ]
$O\left( g \right) + {e^ - } \to O_{\left( g \right)}^ - \,\,\,\,;\,\,\,\,{\Delta _f}{H^\Theta } = - 141\,kJ\,mo{l^{ - 1}}$
${O^ - }\left( g \right) + {e^ - } \to O_{\left( g \right)}^{2 - }\,\,\,\,;\,\,\,\,{\Delta _f}{H^\Theta } = + 780\,kJ\,mo{l^{ - 1}}$
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,