Question

Place the following alcohols in decreasing order of rate of dehydration with `H_(2)SO_(4)`.
`CH_(3)CH_(2)CHunderset((A))((OH))CH_(2)CH_(2)CH_(3)`
`(CH_(3))_(2)Cunderset((B))((OH))CH_(2)CH_(2)CH_(3)`
`(CH_(3))_(2)Cunderset((C))((OH))CH(CH_(3))_(2)`
`CH_(3)CH_(2)CHunderset((D))((OH))CH(CH_(3))_(2)`
`CH_(3)CH_(2)CH_(2)underset((E))(CH_(2))CH_(2)CH_(2)OH`
A. `III gt II gt IV gt V I`
B. `III gt II gt IV gt I gt V`
C. `III gt II gt I gt IV gt V`
D. `III gt II gt I gt V gt IV`

Answer 1

Correct Answer - B
The alcohols (II) and (III) both are `3^(@)`, but alcohol (III) gives a more substituted alkene, Alcohol (IV) and (I) both are `2^(@)`, but alcohol (IV) can give a more substituted alkene and alcohol (V) is `1^(@)`.Rate of dehydration of alcohols with conc. `H_(2)SO_(4)` follows the order
`3^(@) gt 2^(@) gt 1^(@)`