Question 9 (Choice 2) - CBSE Class 10 Sample Paper for 2022 Boards [Term 2] - Science Solution - Solutions to CBSE Sample Paper - Science Class 10

Last updated at Dec. 14, 2024 by

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’.

Answer

a. Ethanol; C 2 H 5 OH

Explanation

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

HCHC.png

 

 

 

 

(b)

(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

 

Note

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