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Why is the solubility of haloalkanes in ...

Why is the solubility of haloalkanes in water very low ?

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Haloalkanes are slightly soluble in water. For the solubility to haloalkane in water, energy is required to overcome the attractions between its own molecules and to break the bonds between water molecules.
Less energy is released when new attractions are set up between the haloalkanes and the water molecules as these are not as strong as the original hydrogen bonds in water.
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Knowledge Check

  • All alkali halides are soluble in water except LiF. The low solublity of LiF in water is due to its (i)______ the low solubility of CsI is due to (ii)_____. LiF is soluble in (iii)_________ solvents.

    A
    (i) low lattice enthalpy, (ii) large hydration enthalpy, (iii) polar solvents
    B
    (i) high lattice enthalpy, (ii) smaller hydration enthalpy, (iii)-non-polar solvents
    C
    (i) high hydration enthalpy, (ii)-high lattice enthalpy, (iii)- non-polar solvents
    D
    (i)-smaller hydration enthalpy, (ii)-high lattice enthalpy, (iii)-polar solvents

  • The low solubility of LiF and that of CsI in water are respectively due to which of the properties of the alkali metal ions?

    A
    Higher hydration enthalpy of `Li^(+)`, higher lattice enthalpy of `Cs^(+)`
    B
    Smaller hydration enthalpy of `Li^(+)`, higher latttice enthalpy of `Cs^(+)`
    C
    Smaller lattice enthalpy of `Li^(+)`, higher hydration enthalpy of `Cs^(+)`
    D
    Higher lattice enthalpy of `Li^(+)`, smaller hydration enthalpy of `Cs^(+)`.

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