How many primary alcohol isomers are there for $C_5H_{11}OH$?

Which of the following compounds is most reactive toward acid-catalyzed hydration?

At room temperature,the alcohol that does not react with Lucas reagent is:

The exact order of boiling points of the compounds $n$-pentane, isopentane, butanone, and $1$-butanol is:

Consider the following alcohols:
$(I)$ $C_6H_5CH_2OH$
$(II)$ $O_2N-C_6H_4-CH_2OH$ (para-nitro)
$(III)$ $CH_3O-C_6H_4-CH_2OH$ (para-methoxy)
$(IV)$ $Br-C_6H_4-CH_2OH$ (para-bromo)
The order of decreasing reactivities of these alcohols towards nucleophilic substitution with $HBr$ is:

Which of the following is $NOT$ produced by the reaction of ethanol with $H_2SO_4$?