Which one of the following compounds does not decolourize bromine water?

Arrange the following in increasing order of boiling point.
$(i)$ methane,butane,propane,pentane,ethane.
$(ii)$ $n$-pentane,neo-pentane,iso-pentane.
$(iii)$ ethane,$2$-methyl propane,propane,$n$-butane.
$(iv)$ $2$-methyl pentane,$2,2$-dimethyl butane,$2,2$-dimethyl propane.

The reaction of ethylene dichloride with aqueous $KOH$ gives .........

When a mixture of methane and oxygen is passed through heated molybdenum oxide,the main product formed is

Which of the following will give two isomeric monochloro derivatives?

The reaction conditions leading to the best yields of $C_2H_5Cl$ are