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AlCl3 exists as a dimer when...

`AlCl_3` exists as a dimer when

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In `AlCl_3` the central Al atom is electron deficient and so it accepts unshared electron pair from the chlorine atom of another molecule to fulfill its octet and hence the dimeric state.
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Knowledge Check

  • AlCl_3 exist as dimer because of

    A
    High charge in nucleus
    B
    Al has greater ionisation potential
    C
    Al has large radius
    D
    Incomplete p - subshell

  • BCl_3 does not exist as dimer but BH_3 exist as dimer (B_2H_6) because :

    A
    Chlorine is more electronegative than hydrogen
    B
    there is `ppi-dpi` back bonding in `BCl_3` but `BH_3` does not contain such multiple bonding
    C
    large sized chlorine atoms do not fit in between the small boron atoms whereas small sized hydrogen atoms get fitted between boron atoms
    D
    none of these

  • This question has Statement I and Statement II. Of the four choices given after the Statement, choose the one that best describes the two Statement. Statement - I : BCl_3 does not exist as dimer. But BH_3 exists as dimer (B_2H_6) Statement - II : There is ppi-ppi back bonding in BCl_3 , but BH_3 does not contain such multiple bonding.

    A
    Statement - I is true, Statement - II is true, Statement - II is a correct explanation of Statement - I
    B
    Statement - I is true, Statement - II is true, Statement - II is not a correct explanation of Statement - I.
    C
    Statement - I is true, Statement - II is false
    D
    Statement - I is false, Statement - II is true.

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