Ethers when dissolved in cold concentrated sulphuric acid forms

The volume of a gas at $$0^{\circ} \mathrm{C}$$ is $$2 \mathrm{~dm}^3$$. What is its volume if temperature is decreased by $$272^{\circ} \mathrm{C}$$ ?

The major product obtained in the following reaction is Chlorobenzene + chlorine $$\xrightarrow[\mathrm{FeCl}_3]{\text { Anhydrous }}$$ product (Major)

How many moles of urea are present in 5.4 g ? (Molar mass = 60)