A mixture of oxygen and ethyne is burnt for welding. Can you tell why a mixture of ethyne and air is not used?

2

(a)

How would you distinguish experimentally between an alcohol and a carboxylic acid?

2

(a)

What will be the formula and electron dot structure of cyclopentane?

2

(a)

Explain the formation of scum when hard water is treated with soap.

2

(a)

Draw the electron dot structure of ethyne and also draw its structural formula.

2

(a)

(a) What is meant by a functional group in an organic compound? Name the functional group present in
(i) CH₃CH₂OH
(ii) CH₃COOH
(b) State one point of difference between soap and synthetic detergent.

2

(a)

Write the name and molecular formula of an organic compound having its name suffixed with '-ol and having two carbon atoms in the molecule. Write the help of a balanced chemical equation indicate what happens when it is heated with excess of conc. H₂SO₄

2

(a)

What is a homologous series? Which two of the following organic compounds belong to the same homologous?

2

(a)

An organic compound 'A' is an essential constituent of wine and beer. Oxidation of 'A' yields an organic acid 'B' which is present in vinegar. Name the compounds 'A' and 'B' and write their structural formula. What happens when 'A' and 'B' react in the presence of an acid catalyst? Write the chemical equation for the reaction. 

2

(a)

Describe two examples of different oxidation of ethanol. Name the products obtained each case.

2

(a)

What are isomers? Draw the structures of two isomers of butane, C₄H₁₀. Why can't we have isomers of first three members of alkane series?

2

(a)

Name the oxidizing agent used for the conversion of ethanol to ethanoic acid. Distinguish between ethanol and ethanoic on the basis of
(i) litmus test.
(ii) reaction with sodium hydrogen carbonate.

2

(a)

Distinguish between esterification and saponification reactions of organic compounds with the help of the chemical equation for each. What is the use of
(i) esters and
(ii) saponification process?

2

(a)

Write the name and the structural formula of the compound formed when ethanol is heated at 443 K with excess of conc. H₂SO₄ . State the role of conc. H₂SO₄ in this reaction. Write chemical equation for this reaction.

2

(a)

State the meaning of functional group in a carbon compound. Write the functional group present in (i) ethanol and (ii) ethanoic acid and also draw their structures.

2

(a)