What is osmotic pressure of solution of $$1.7 \mathrm{~g} \mathrm{~CaCl}_2$$ in $$1.25 \mathrm{~dm}^3$$ water at $$300 \mathrm{~K}$$ if van't Hoff factor and molar mass of $$\mathrm{CaCl}_2$$, are 2.47 and $$111 \mathrm{~g} \mathrm{~mol}^{-1}$$ respectively?

$$\left[\mathrm{R}=0.082 \mathrm{~dm}^3 \mathrm{~atm} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\right]$$

Which among the following pair of properties is intensive?

Identify the molecular formula of an alkane that exhibits only two different structural isomers.

An organic compound '$$\mathrm{A}$$' on reaction with $$\mathrm{PCl}_3$$ gives an alkyl chloride having formula $$\mathrm{C}_3 \mathrm{H}_7 \mathrm{Cl}$$. '$$\mathrm{A}$$' on oxidation with $$\mathrm{PCC}$$ forms an aldehyde having formula $$\mathrm{C}_3 \mathrm{H}_6 \mathrm{O}$$. Identify '$$\mathrm{A}$$'.