Which of the following is soluble in water?

Ethyl alcohol is heated with cone.$H_{2}S{O}_{4}H\_2SO\_4$. The product formed is

HBr reacts fastest with

When phenyl magnesium bromide reacts with tertiary butanol, which of the following is formed?

The best method to prepare cyclohexene from cyclohexanol is by using

Phenol can be distinguished from alcohol by which reagent :

Phenol reacts with bromine in carbon disulphide at low temperature to give?

Phenol is least reactive for aromatic nucleophilic substitution because :

Phenol reacts with benzene diazonium cation at pH 7.5 to give :

In the following reaction, $C_2{H}_{5}O{C}_2{H}_5+4H\stackrel{RedP+HI}{\to }2X+H_{2}OC\_2H\_5OC\_2H\_5+4H\backslash xrightarrow\{Red\backslash ,P+\; HI\}2X+H\_2O$ , X  is