Question

Q. 25. (a) Write the name of the
functional group in CH,COCH,. -
(b) An organic compound burns with a
sooty flame. Is it saturated or unsaturated
hydrocarbon?
(c) Giving balanced equation state how
you will convert methane to carbon
dioxide.
(d) Why does micelle formation take
place when soap is added to water? Will a
micelle be formed in all type of solvents?
Justify your answer.
Or
(a) Differentiate between soap and
detergent.
(b) Explain why, soap from scum with
hard water whereas detergents do not.
Q. 26. (a) Define activity, series of
metals. Arrange the metals gold, copper,
iron and magnesium in order of their
increase in reactivity.
(b) What will you observe when:
(i) Some zinc pieces are put in copper
sulphate solution.
(ii) Some silver pieces are put into
green coloured ferrous sulphate solution​

Answer 1

• CHCOCH- carbonyl.
• An organic compound burns with a sooty flame, it is an unsaturated compound. Because, when an unsaturated compound is burned it will give a yellow flame with lots of smoke. This is the sooty flame. This happens due to incomplete combustion. When the compound is burned in a limited supply of oxygen, it will release CO (Carbon monoxide) in place of CO2 resulting in incomplete combustion. Hence, unsaturated compound gives sooty flame due to incomplete combustion.
• In the equation below methane (CH4) is being burned. The oxygen will combine with carbon and the hydrogen in the methane molecule to produce carbon dioxide (CO2) & water (H2O). The balanced reaction is as under/ as follows: CH4+ 2O2---->CO2 + 2{H2O}
• When soap is added to water, micelle formation takes place, this is because the hydrocarbon chains of soap molecules are hydrophobic while the ionic ends are hydrophilic and hence soluble in water. Micelle will not form in all types of solvents. It will form in such type of solvent where soap is insoluble in that particular solvent.