Predict the major product, when 2-methyl but-2-ene is converted into an alcohol in each of the following methods.
(i) Acid catalysed hydration.
(ii) Hydroboration
(iii) Hydroxylation using Bayer's reagent.

Explanation

(i) Acid catalysed hydration :
`underset(("2- methyl - but -2-ene"))(CH_3-underset(CH_3)underset(|)C-CH-CH_3)overset(H^+//H_2O)rarrCH_3-underset(("2- methyl - butan - 2- ol"))(underset(CH_3)underset(|)overset(OH)overset(|)C-CH_2-CH_3)`
(ii) Hydroboration :
`underset(("2- methyl - but -2-ene"))(6CH_3-underset(CH_3)underset(|)C=CH-CH_3+B_2H_6)rarr2((CH_3)_2CH-overset(CH_3)overset(|)(CH))_3B`
`((CH_3)_2CH-overset(CH_3)overset(|)(CH))_3B+3H_2O_2overset(H^(o+))rarrunderset((3-"methyl - butane - 2- ol"))(3CH_3-overset(CH_3)overset(|)(CH)-overset(CH_3)overset(|)(CH)-OH+H_3BO_3)`
(iii) Hydroxylation using bayers reagent :
`underset(("2 - methyl - but - 2 ene"))(CH_3-underset(CH_3)underset(|)C=CH-CH_3)underset((O))overset("Cold "KMnO_4//OH^(o+))rarrunderset(("2- methyl - butan 2,3-diol"))(3CH_3-underset(CH_3)underset(|)overset(OH)overset(|)C-overset(OH)overset(|)(CH)-CH_3)`