A carbon compound ‘A’ having melting point 156K and boiling point 351K, with molecular formula C 2 H 6 O is soluble in water in all proportions.

a. Identify ‘A’ and draw its electron dot structure.

b. Give the molecular formulae of any two homologues of ‘A’.


a. Ethanol; C 2 H 5 OH


Ethanol is a colourless liquid having boiling point 351k and melting point 156k

Also it is soluble in water

Its formula is C 2 H 5 OH


Electron Dot Structure of Ethanol is as follows







(Ethanol is an alcohol

Examples of Alcohols

Methanol CH 3 OH
Ethanol C 2 H 5 OH
Propanol C 3 H 7 OH
ButanoL C 4 H 9 OH



All the above are homologues

Homologues are group of chemical compounds which have similar structure and similar chemical properties and successive compounds differ by CH2

We can say that homologues of ethanol are

Methanol CH 3 OH
Propanol C 3 H 7 OH



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CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo