MCQ
Which one among the following carbocations has the longest half-life ?
- ✓

- B

- C

- D$\begin{array}{*{20}{c}}
{C{H_3} - \mathop C\limits^ + - C{H_3}} \\
| \\
{C{H_3}}
\end{array}$





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Product $(A)$ is
| Catalyst | Process |
| $(i) \;\mathrm{Na}_{2} \mathrm{O}$ | $(a)$ The oxidation of ethyne to ethanal |
| $(ii) \;\mathrm{TiCl}_{4}+ \mathrm{Al(CH_3)}_{3}$ | $(b)$ Polymerisation of alkynes |
|
$(iii)\;\mathrm{PdCl_2} $ |
$(c)$ Oxidation of $SO_2$ in the manufacture of $H_2SO_4$ |
| $(iv)\;$Nickel complexes | $(d)$ Polymerisation of ethylene |
Which of the following is the correct option ?