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The temporary effect in which there is c...

The temporary effect in which there is complete transfer of a shared pair of pi-electrons to one of the atoms joined by a multiple bond on the demand of an attacking regent is called

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The correct Answer is:
D
Electromeric effect involves the complete transfer of electrons of a multiple bond (double or triple bond) to one of the bonded atoms (usually more electronegative) in presence of an attacking reagent. This effect is temporary and takes place only in the presence of a reagent. As soon as the reagent is removed, the molecule reverts back to its original position.
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Knowledge Check

  • Assertion : When inductive and electromeric effects operate in opposite directions, the inductive effect. Predominates. Reason : Inductive effect is the complete transfer of shared pair of pi electrons to one of the atoms.

    A
    If both (A) and (R ) are correct and (R ) is the correct explanation of (A)
    B
    If both (A) and (R ) are correct, but (R ) is not the correct explanation of (A)
    C
    If (A) is correct, but (R ) is incorrect
    D
    If both (A) and (R ) are incorrect

  • Assertion : Heterolytic fission involves breaking of bond in such a way that the shared pair of electrons go. Reason : Heterolytic fission involves breaking of bond in such a way that the shared pair of electrons go with one atom. Reason : Heterolytic fission involves breaking of bond in such a way that the shared pair of electrons go with one atom.

    A
    If both (A) and (R ) are correct and (R ) is the correct explanation of (A)
    B
    If both (A) and (R ) are correct, but (R ) is not the correct explanation of (A)
    C
    If (A) is correct, but (R ) is incorrect
    D
    If both (A) and (R ) are incorrect

  • The ionization energy of an element depends upon nuclear charge, atomic size, penetration effect of the 'electrons, shielding effect of the inner electrons and electronic configuration (exactly half filled & completely filled configuration are extra stable). The electron affinity of an element depends upon atomic size, nuclear charge and electronic configuration. In general, ionization energy and electron affinity increases as the atomic radii decreases and nuclear charge increases across a period. In general, in a group, ionization energy and electron affinity decrease as the atomic size increases. The members of third period have higher electron affinity values than the members of second period elements have very small atomic size. Hence there is a tendency of electron electron repulsion, which results in less evolution of energy in the formation of corresponding anion. Which one of the following statements is incorrect in relation to ionisation enthalpy?

    A
    Ionization enthalpy increases for removal of successive electrons.
    B
    The greatest increase in ionization enthalpy is experienced on removal of electron from core of noble gas configuration.
    C
    End of valence electrons is marked by a big jump in ionization enthalpy.
    D
    Removal of electron from orbitals bearing lower n value is easier than from orbital having higher n value.

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    The ionization energy of an element depends upon nuclear charge, atomic size, penetration effect of the 'electrons, shielding effect of the inner electrons and electronic configuration (exactly half filled & completely filled configuration are extra stable). The electron affinity of an element depends upon atomic size, nuclear charge and electronic configuration. In general, ionization energy and electron affinity increases as the atomic radii decreases and nuclear charge increases across a period. In general, in a group, ionization energy and electron affinity decrease as the atomic size increases. The members of third period have higher electron affinity values than the members of second period elements have very small atomic size. Hence there is a tendency of electron electron repulsion, which results in less evolution of energy in the formation of corresponding anion. Considering the elements F, Cl, O and S, the correct order of their electron affinity values is:

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