A compound C (molecular formula, C₂H₄O₂) reacts with Na - metal to form a compound R and evolves a gas which burns with a pop sound. Compound C on treatment with an alcohol A in presence of an acid forms a sweet smelling compound S (molecular formula, C₃H₆O₂). On addition of NaOH to C, it also gives R and water. S on treatment with NaOH solution gives back R and A. Identify C, R, A, S and write down the reactions involved.

How would you bring about the following conversions? Name the process and write the reaction involved.
a) Ethanol to ethene.
b) Propanol to propanoic acid

Draw the possible isomers of the compound it molecular formula C₃H₆O and also give their electron dot structures.

An organic compound A on heating with concentrated H₂SO₄ forms a compound B which on addition of one mole of hydrogen in presence of Ni forms a compound C. One mole of compound C on combustion forms two moles of CO₂ and 3 moles of H₂O. Identify the compounds A, B and C and write the chemical equations of the reactions involved.

Look at the below figure and answer the following questions:

a) What change would you observe in the calcium hydroxide solution taken in tube B?
b) Write the reaction involved in test tubes A and B respectively.
c) If ethanol is given instead of ethanoic acid, would you expect the same change?
d) How can a solution of lime water be prepared in the laboratory?