Section A: Identify 'X', 'Y', 'Z' Puzzles
Solve these identification problems:
- An organic compound A is essentially a constituent of wine and beer. On heating
with alkaline Potassium Permanganate, it gives another organic compound B which
keeps freezing in winter. Compound A and B react in the presence
of sulphuric acid to form a sweet smelling compound C.
(a) Identify A, B and C.
(b) Write the chemical equation for the formation of C.
- A neutral organic compound X of molecular formula $C_2H_6O$ on heating with excess
of concentrated $H_2SO_4$ at 443 K gives a compound Y. Compound Y
on hydrogenation in the presence of Nickel catalyst gives Z.
(a) Identify X, Y and Z.
(b) Write the equation for the formation of Y.
(c) What is the role of Sulphuric Acid here?
- An organic compound A is widely used as a preservative in pickles and has a
molecular formula $C_2H_4O_2$. This compound reacts with ethanol to form a sweet smelling compound
B.
(a) Identify the compound A.
(b) Write the chemical equation for its reaction with ethanol to form B.
(c) Name the process.
- Compound X with molecular formula $C_2H_6O$ burns with a blue flame. It is also
used as a fuel in cars along with petrol. Identify X and write the combustion
equation.
- A mixture of oxygen and ethyne is burnt for welding. Can you explain why a mixture of ethyne and air
is not used?
Section B: Structural Analysis & Isomerism
- Draw the possible structural isomers for Pentane ($C_5H_{12}$). Name them.
- How many structural isomers can you draw for Butane ($C_4H_{10}$)? Draw them.
- A cyclic carbon compound has formula $C_6H_{12}$. Draw its structure. How many single bonds are
present in it?
- Draw the electron dot structure for Ethyne ($C_2H_2$). How many covalent bonds does it have?
- What is a Homologous Series? Explain with an example. state two characteristics of a homologous
series.
Section C: Differentiate & Reason
- Differentiate between Ethanol and Ethanoic acid on the basis of:
(a) Physical state
(b) Reaction with Sodium Carbonate
- Differentiate between Diamond and Graphite on the basis of:
(a) Structure
(b) Electrical conductivity
- What is Saponification? Write the reaction for the preparation of soap.
- What forms the "hard" part of hard water? Why does soap fail in hard water?
- Why is the conversion of Vegetable Oil to Vegetable Ghee considered a Hydrogenation reaction? Name
the catalyst used.
