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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$Ph - C \equiv C - Ph \to $ 
$(i)$ Glucose $+ ROH \quad \stackrel{\text { dry } HCl }{\longrightarrow}$ Acetal
$\xrightarrow[{{{\left( {C{H_3}CO} \right)}_2}O}]{{x\,eq.of}}$ acetyl derivative
$(ii)$ Glucose $\xrightarrow{{Ni/{H_2}}}A\xrightarrow[{{{\left( {C{H_3}CO} \right)}_2}O}]{{y\,\,eq.\,of}}$ acetyl derivative.
$(iii)$ Glucose $\xrightarrow[{{{\left( {C{H_3}CO} \right)}_2}O}]{{z\,ed.\,of}}$ acetyl derivative.
$' x ^{\prime},{ }^{\prime} y ^{\prime}$ and ${ }^{\prime} z^{\prime}$ in these reactions are respectively.