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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^(+)`.
    • NCERT EXEMPLAR ENGLISH-HALOALKANES AND HALOARENES-Short Answer Type Questions
    1. Which of the following compounds (i) and (ii) will not react with a mi...

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    2. Which of the products will be major product in the reaction given belo...

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    3. Why is the solubility of haloalkanes in water very low ?

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    4. Draw other resonance structures related to the following structure and...

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    5. Classify the following compounds as primary, secondary and tertiary h...

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    7. Write the structures and names of the compounds formed when compound '...

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    8. Identify the product A and B formed in the following reaction CH(3)-...

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    9. Which of the following compounds will have the highest melting point a...

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    10. Write down the structure and IUPAC name for neo-pentylbromide.

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    11. A hydrocarbon of molecular mass 72 g mol^(-1) gives a single monochlor...

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    12. Name of the alkene which will yield 1-chloro-1-methylcyclohexane by it...

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    13. Which of the following haloalkanes reacts with aqueous KOH most easily...

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    14. Why can aryl halides not be prepared by reaction of phenol with HCl in...

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    15. Which of the following compounds would undergo S(N)1 reaction faster a...

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    16. Allyl chloride is hydrolysed more readily than n-propyl chloride. Why ...

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    17. Why is it necessary to avoid even traces of moisture during the use of...

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    18. How do polar solvents help in the first step in S(N)1 mechanism?

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    19. Write a test to detect the presence of double bond in a molecule.

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