Question 4 - Past Year - 2 Mark Questions - Chapter 4 Class 10 - Carbon and its Compounds

Last updated at Dec. 13, 2024 by

On dropping a small piece of sodium in a test-tube containing carbon compound 'X' with molecular formula C 2 H 6 O, a brisk effervescence is observed and a gas 'Y' is produced. On bringing a burning splinter at the mouth of the test-tube the gas evolved burns with a pop sound. Identify 'X' and 'Y'. Also write the chemical equation for the reaction. Write the name and structure of the product formed, when you heat 'X' with excess conc. sulphuric acid.

 

Answer:

Reaction given in the question - Teachoo.png

Alcohols react with sodium metal to give bubbles of hydrogen gas.

  • The molecular formula of X is given as C 2 H 6 O which means X is C 2 H 5 OH
  • Hydrogen gas is produced. So, Y is H 2
  • When a burning splinter is brought close to the mouth of the test tube where the reaction between C 2 H 5 OH  and Na has taken place, H 2 gas burns with a pop sound.

So,the reaction that takes place is:

Reaction of Ethanol with Sodium - Teachoo.png

If we heat ethanol with excess concentrated sulphuric acid, a dehydration reaction takes place, a water molecule is removed and ethene is formed.

Molecular formula of ethene is C 2 H 4

Reaction of conversion of Ethanol to Ethane - Teachoo.png

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Transcript

On dropping a small piece of sodium in a test-tube containing carbon compound 'X' with molecular formula C2H6O, a brisk effervescence is observed and a gas 'Y' is produced. On bringing a burning splinter at the mouth of the test-tube the gas evolved burns with a pop sound. Identify 'X' and 'Y'. Also write the chemical equation for the reaction. Write the name and structure of the product formed, when you heat 'X' with excess conc. sulphuric acid. Answer: Alcohols react with sodium metal to give bubbles of hydrogen gas. The molecular formula of X is given as C2H6O which means X is C2H5OH Hydrogen gas is produced. So, Y is H2 When a burning splinter is brought close to the mouth of the test tube where the reaction between C2H5OH and Na has taken place, H2 gas burns with a pop sound. So,the reaction that takes place is: If we heat ethanol with excess concentrated sulphuric acid, a dehydration reaction takes place, a water molecule is removed and ethene is formed. Molecular formula of ethene is C2H4

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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