How would you obtain the following :
(i) Benzoquione from phenol
(ii) 2-Methylpropan-2-ol from methylmagnesium bromide
(iii) Propan-2-ol from propene

Explanation

(i) Benzoquinone from Phenol

(iii) `underset("bromide")underset("Magnesium ")underset("Methyl")(CH_(3)MgBr) +CH_(3) - underset("Propanone")underset(O)underset(||)C - CH_(3) toCH_(3)-underset(O""MgBr)underset(|)overset(CH_(3))overset(|)C-CH_(3)overset(H_(2)O //H^(+))toCH_(3) - underset("2-Methyl Propan-2-ol")underset(CH_(3)) underset(|)overset(CH_(3))overset(|)C-OH + Mg(Br) (OH)`
(iii) `underset("Propane")(CH_(3)CH)=CH_(2)overset(HBr)tounderset("2-Bromopropane")(CH_(3)overset(OH)overset(|)(CHCH_(3)))underset(-KBr)overset(Aq.KOH)tounderset("Propan-2-ol")(CH_(3)overset(OH)overset(|)CHCH_(3))`