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Unsaturated hydrocarbons contain multipl...

Unsaturated hydrocarbons contain multiple bonds between the two C-atoms and show addition reaction. Give the test to distinguish ethane from ethene.

Text Solution

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Bromine solution in `C Cl_(4)` has an orange colour. When it is added dropwise to ethene, the orange colour disappears due to the formation of the colourless ethylene dibromide. This reaction is not shown by ethane as it is addition reaction.
`underset("Ethene")(CH_(2)=CH_(2))underset(("orange"))underset("Bromine")(+Br_(2))tounderset(("colourless"))underset("Ethylene dibromide")underset(Br)underset(|)(CH_(2))-underset(Br)underset(|)CH_(2)`
The two can be distinguished also by subjecting them to the flame. Saturated hydrocarbon (ethane) generally gives a clear flame while unsaturated hydrocarbon (ethene) gives a yellow flame with lots of black smoke.
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Knowledge Check

  • Benzene contains double bonds but does not give addition reactions because

    A
    Double bonds in benzene rinig are strong
    B
    Double bonds change their position rapidly
    C
    Resonance lowers the energy of benzene molecule and leads to greater stabilization
    D
    Benzene has cumulative double bonds.

  • The number and type of bonds between two C-atom in SrC_(2) are .

    A
    `1sigma,1pi`
    B
    `1sigma,2pi`
    C
    `1sigma,5pi`
    D
    `1sigma`

  • The number and type of bonds between two carbon atoms in C_(2) are:

    A
    one sigma `(sigma)` and one pi `(pi)` bonds
    B
    two pi `(pi)` bonds
    C
    one sigma `(sigma)` and one half pi `(pi)` bonds
    D
    one sigma `(sigma)` bond

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    Propene undergoes addition reaction. iii. Unsaturated compounds contain multiple bonds as their functional group and hence, they undergo addition reaction to forms a saturated compound as the product. Hence, propene undergoes addition reaction.

    Propene undergoes addition reaction. iii. Unsaturated compounds contain multiple bonds as their functional group and hence, they undergo addition reaction to forms a saturated compound as the product. Hence, propene undergoes addition reaction.

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