Write the mechanism of acid dehydration of ethanol to yield ethene.

How are the following conversion carried out?

 Benzyl chloride $\to$ Benzyl alcohol.

How is the following conversion carried out?

Ethyl magnesium chloride $\to$ Propan-$1$-ol.

How is the following conversion carried out?

Methyl magnesium bromide $\to$ 2-Methylpropan-2-ol.

Name the reagent used in the following reaction:

Oxidation of a primary alcohol to aldehyde.

Name the reagent used in the following reaction:

 Bromination of phenol to $2,4,6$-tribromophenol.

Name the reagent used in the following reaction:

Benzyl alcohol to benzoic acid.