Which one of the following compounds gives a positive iodoform test?

The high boiling point of ethanol $({78.2 \ ^\circ C})$ compared to dimethyl ether $({-23.6 \ ^\circ C})$,though both have the same molecular formula $C_2H_6O$,is due to

In the reaction of alcohols with alkali metals,acids,etc.,which of the following alcohols will react fastest?

Lucas reagent is

The compound $A$ when treated with ceric ammonium nitrate solution gives a yellow precipitate. The compound $A$ is

Arrange the following substances in the increasing order of their normal boiling points: Ether,Carbon tetrachloride,Ethanol,and Water.