17. (a) What is a homologous series of compounds? List any two characteristics of a
homologous series.
(b) (i) What would be observed on adding a 5% alkaline potassium permanganate
solution drop by drop to some warm ethanol in a test tube?
(ii) Write the name of the compound formed during the chemical reaction.
(c) How would you distinguish experimentally between an alcohol and a carboxylic a
on the basis of a chemical property?
Answers
Answer:
ANSWER 1]
A homologous series is aseries of organiccompounds having similar chemicalproperties due to the presence of same functional group. The members of ahomologous series are arranged in order of their increasing molar masses.Two consecutive members of ahomologous series differ by a –CH2– unit and a mass of 14 amu.
[ ANSWER 2 ]
The rkn u can see in pic ...I don't have much info about this answer sry...
[ ANSWER 3 ]
(i)Litmus test – Alcohol will have no effect on the litmus paper. Carboxylic acid acid will change blue litmus paper into red.
(ii)Reaction with sodium hydrogen carbonate – Alcohol has no reaction with sodium hydrogen carbonate (NaHCO3) but in the case of Carboxylic acid it reacts with NaHCO3 which gives CH3COONa, CO2 and H2O. The reaction is evident as the carbon dioxide will turn the lime water milky.
★ A homologous series is aseries of organiccompounds having similar chemicalproperties due to the presence of same functional group. The members of ahomologous series are arranged in order of their increasing molar masses.Two consecutive members of ahomologous series differ by a –CH2– unit and a mass of 14 amu
★ Litmus test – Alcohol will have no effect on the litmus paper. Carboxylic acid acid will change blue litmus paper into red.
★ Reaction with sodium hydrogen carbonate – Alcohol has no reaction with sodium hydrogen carbonate (NaHCO3) but in the case of Carboxylic acid it reacts with NaHCO3 which gives CH3COONa, CO2 and H2O. The reaction is evident as the carbon dioxide will turn the lime water milky.