Chemistry Assignment-I (For month of November) Chapter:(carbon and its compounds)
1. An organic compound X with a molecular formula C2H6O undergoes
oxidation with in presence of alkaline KMnO4 to form a compound Y. X on heating
in presence of Conc. H2SO4 at 443K gives Z. Which on reaction with H2Oin
presence of H2SO4 gives back `X` `Z` reacts with Br2 (aq) and decolorizes it.
Identify X, Y, & Z and write the reactions involved.
2. An organic compound ‘A’ is widely used as a preservative in
pickles and has a molecular formula C2H2O2. This compound reacts with ethanol
to form a sweet smelling compound ‘B’.
(i) Identify the compound ‘A’
(ii) Write the chemical equation for its reaction with ethanol to
form compound ‘B’.
(iii) How can we get compound ‘A’ back from ‘B’?
(iv) Name the process and write corresponding chemical equation.
(v) Which gas is produced when compound ‘A’ reacts with washing
soda? Write the chemical equation.
3. Hydrocarbon `X` and `Y` having molecular formulae C3H8 and C3H6
respectively. Both are burnt in different spatula on the Bunsen flame. Indicate
the color of the flame produced by `X` and `Y`. Identify `X` and `Y`. Write the
structural formulae.
4. A compound `X` has molecular formula C4H10. It undergoes
substitution reaction readily than addition reaction. It burns with blue flame
and is present in LPG. Identify `X` and give the balanced equation for its
combustion and substitution reaction with Cl2 in presence of sunlight.
5. `A` compound works well with hard water. It is used for making
shampoos & products for cleaning clothes. A is not 100% biodegradable and
causes water pollution. `B` does not work well with hard water. It is 100%
biodegradable and does not create water pollution. Identify A & B.
6. An organic compound P with molecular formula C2H6Ois an active
ingredient of all alcoholic drinks. It is also used in medicines such as
tincture iodine, cough syrups. Identify `P`. Drop a small piece of sodium into
the test tube containing `P`.A new compound `Q` is formed with the evaluation
of colorless and odorless gas Name the gas evolved and compound `Q` write the
chemical reaction.
7. A cyclic compound `X` has molecular formula C6H6. It is unsaturated
and burns with sooty flame. Identify `X` and write its structural formula. Will
it decolorize bromine water or not and why?
8. An organic compounds `A` is a constituent of antifreeze and has
the molecular formula C2H6O upon reaction with alkaline KMnO4, the compound `A`
is oxidized to another `B` with formula C2H6O2. Identify the compound A` and
`B`. Write the chemical equation for the reaction which leads to the
formulation of `B`
9. Two compounds `X` and `Y` have the same formula C2H4O2. One of
them reacts with sodium metal to liberate H2 and CO2 with NaHCO3. Second one
does not reacts with Na metal and NaHCO3 but undergo hydrolysis with NaOH to
form salt of carboxylic acid and compound `Z` which is called wood spirit.
Identify `X`, `Y`, and `Z` and write chemical equation for the reaction involved.
10. A compound `X` with molecular formula C2H4 burns with a sooty
flame. It decolourise bromine water. Identify `X`. Will it dissolve in water or
not? Will it conduct electricity in aq. Solution? Will it have high melting
point or low melting point?
11. Write the formula for ‘ethanoic acid’ and name the functional
group present in it.
12. Allotropy is a property shown by which class: - Substances,
elements, compounds, mixture.
13. What is the use of oxyacetylene flame?
14. Name the gas which is formed by decomposition of plants and
animal matter in marshy areas?
15. How will you distinguish between ethanol and ethanoic acid by a
suitable chemical test? Write chemical reactions involved.
16. Write the molecular formula and structures of benzene.
17. Match the following:-
(a) Ethane - Used in anti freeze solution.
(b) Ethanol - fruity smell.
(c) Ester - fossil fuel.
18. Complete the following reactions:-
(a) CH3COOH + NaHCO3 ----conc.H2SO4------>
(b) HCOOH + CH3OH --------->
(c) CH3COOC2H5 + H2O --------->
19. Name the compound CH3COOC2H5.Name the acid and alcohol from which
it is made, write equation.
20. Two alkanes A and B have 4 and 6 carbon atoms respectively in
their molecule. In which physical state will they occur at room temp?
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