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Statement-1: Alkynes are more reactive t...

Statement-1: Alkynes are more reactive than alkene towards HBr
and Statement-2: Alkynes have higher degree of unsaturation than alkenes.

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The correct Answer is:
D
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Alkynes are .......... acidic than alkenes.

Explain why alkynes are less reactive than alkenes toward addition of Br_(2) .

Knowledge Check

  • Propene is more reactive than ethene towards HBr because

    A
    propene can more readily undergo a free radical chain reaction
    B
    propene gives rise to more stable carbocation
    C
    the double bond in case of propene is unstable
    D
    the methyl group attached to double bond withdraws electrons and facilitates the attack.

  • Propene is more reactive than ethene towards HBr because:

    A
    propene can more readily undergo a free radical chain reaction.
    B
    propene gives rise to more stable carbonium ion
    C
    the double bond in case of propene is unstable
    D
    the methyl group attached to double bond withdraws electrons and facilitates the attack.

  • Identify the incorrect statement // statement : (i) Alkynes are more reactive than alkenes towards electrophilic addiction reaction (ii) Alkynes are less reactive than alkenes towards electrophilic addiction reaction (iii) Alkynes decolourise Br_(2) water (iv) Addition of HBr to alkenes in presence of peroxide proceeds via Markownikoff's rule

    A
    `(i) & (ii)`
    B
    `(ii) & (iii)`
    C
    `(i) & (iii)`
    D
    `(ii) & (iv)`

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    Statement-I: Alkenes are more reactive than alkynes towards HX. Statement-II: Alkyl carbocation is more stable tha vinyl carbocation.

    A : Alkynes is more reactive than alkene towards electrophilic addition reaction. R : Alkynes form stable carbocation than alkene.

    Alkynes are less reactive than alkenes towards addition of Br_2 because :-

    S-I: Alkynes are more reactive than alkene towards catalytic hydrogenation S-II: Alkynes are less reactive towards electrophilic reactio than alkenes

    Statement-1: Ethyne is more reactive than ethene towards hydrogenation Statement-2: H_(2) in presence of Lindlar catalyst is more reactive than H_(2) with Pd in hydrogenation reaction Statement-3: Dipole moment of o-xylene is greater than m-xylene

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