MCQ
is prepared best by the reaction


- A$(CH_3)_3 C-Br + CH_3OK \to$
- B${(C{H_3})_3}C - OH\xrightarrow[{{{170}\,^o}C}]{{{H_2}SO}}$
- ✓$(CH_3)_3 COK + CH_3-Br \to$
- D${(C{H_3})_2}C = C{H_2}\xrightarrow{{Conc.\,\,{H_2}S{O_4}}}$

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The electrolyte $X$ is :
The order of decreasing reactivities of these alcohols towards nucleophilic substitution with $HBr$ is
| Ltst $I$ | List $II$ |
| $A$ $XeF _4$ | $I$ See-saw |
| $B$ $SF _4$ | $II$ Square planar |
| $C$ $NH _4^{+}$ | $III$ Bent T-shaped |
| $D$ $BrF _3$ | $IV$ Tetrahedral |
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