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Question 15 Marks
Explain the fact that why organic com pounds are Iarge in number.
Answer
Organic compounds are large in number due to the following unique properties of carbon atom:
a) Tetra covalency of carbon : Carbon has four alence shell electrons. Thus it always forms covalent bonds by sharing electrons with other atoms.
b) Catenation : it is the property of combining any number of carbon atoms to form straight chains, branched chains and rings of different sizes.
c) Formation of multiple bonds: due to small size carbon atom can form multiple bonds with not only carbon but with atoms of other elements like oxyzen, nitrogen etc.
d) isomerism : It forms large number of compounds due to isomerism by means of which compounds having same molecular formula can be have different structural formula.
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Question 25 Marks
Give four differences between organic and inorganic cornpounds.
Answer
S.No.Organic CompoundsInorganic Compounds
1.Occurs in living matter i.e. animals and plants. Found from Non-living matter i.e. Minerals.
2.They have low melting and boiling points.They have high melting and boiling points.
3.Insoluble in waterSoluble in water
4.They are generally nonvolatile
and inflammable.
They are generally non-volatile and non-combustible.
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Question 35 Marks
Give the trivial names and $IUPAC$ names of the following:
(a) $C_3H_6$
(b) $C_2H_4$
(c) $C_2H_2$
(d) $CH_30H$
(e) $CH_3COOH$
Answer
S.No. Compound Trivial Name IUPAC
(a) $C_3H_6$ Propylene Propene
(b) $C_2H_4$ Ethylene Ethene
(c) $C_2H_2$ Acetylene Ethyne
(d) $CH_30H$ methyl alcohol methanol
(e) $CH_3COOH$ Acetic Acid Ethanoic acid
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Question 45 Marks
Give the names of any three alkyl groups. How are they formed?
Answer
The three alkyl groups are:
  • Methyl
  • Ethyl
  • Propyl
Formation of alkyl group:
  • Methyl:
    $CH _4 \xrightarrow{- H } CH _3-$
  • Ethyl:
    $C _2 H _6 \xrightarrow{- H } C _2 H _5-$
  • Propyl:
    $C _3 H _8 \xrightarrow{- H } C _3 H _7-$
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