Question

Acid catalyzed hydration of alkenes except ethene leads to the formation of
(a) primary alcohol
(b) secondary or tertiary alcohol
(c) mixture of primary and secondary alcohols
(d) mixture of secondary and tertiary alcohols

Answer 1

Write some acid catalysed hydration reactions of substituted alkene and check the results. CH2=CH2−→−−−−H2O/H+CH3CH2OH CH2−CH=CH2−→−−−−H2O/H+CH3CHCH3|OH (2∘alcohol) through 2∘ carbocation CH3CH⊕CH3 CH3−C|CH3=CH2−→−−−−H2O/H+(CH3)3COH (3∘alcohol) through3∘carbocation (CH3)3C⊕ CH3−CHCH3|−CH=CH2  CH3−CCH3|⊕−CH23ocarbocation−CH3−→−H2O3oalcohol Thus best alternate is (c).