When ethanol is treated with sulphuric acid at $413 \ K$,the reaction involved in it is:

The compound which gives turbidity immediately with Lucas reagent at room temperature is

An organic compound $(A)$ (molecular formula $C_{6}H_{12}O_{2}$) was hydrolysed with dil. $H_{2}SO_{4}$ to give a carboxylic acid $(B)$ and an alcohol $(C).$ $C$ gives white turbidity immediately when treated with anhydrous $ZnCl_{2}$ and conc. $HCl$. The organic compound $(A)$ is

The decreasing order of dehydration of the following alcohols is:

The best method for the conversion of an alcohol into an alkyl chloride is by treating the alcohol with

When ethyl alcohol and $KI$ react in the presence of $Na_2CO_3$,yellow crystals of which of the following are formed?