--%>
Assignment Help - homework help

Explain physical properties of haloarenes.

. Boiling points

The boiling points of monohalogen derivatives of benzene, which are all liquids, follow the order

Iodo > Bromo > Chloro

The boiling points of isomeric dihalobenzenes are nearly the same. However, their melting points are fairly dissimilar. The melting point of para isomer is generally 70-100 degrees higher than the melting points of ortho and meta isomers. The higher melting point of para isomer is due to its symmetry which leads to more close packing of its molecules in the crystal lattice and consequently strong intermolecular attractive forces.

Boiling point:    453 K              446 K            448 K

Melting point:   256 K              249 K            323 K

2. Solubility

Haloarenes are insoluble in water, acids or bases but are soluble in organic solvents.

Haloarenes are insoluble in water because they cannot form hydrogen bonds with water molecules.

3. Density 

These are all heavier than water. Their densities follow the order given below.

Iodo > Bromo > Chloro

   Related Questions in Chemistry

  • Q : What is Elevation in boiling point? The

    The boiling of a liquid may be defused by the temperature at which its vapour pressure which is equal to atmospheric pressure. The effect of addition in a non-volatile solute on the boiling point shown and its solution containing non-volatile solute with tempe

    		•
  • Q : Effect of addition of mercuric iodide

    Give me answer of this question. When mercuric iodide is added to the aqueous solution of potassium iodide, the:(a) Freezing point is raised (b) Freezing point is lowered (c) Freezing point does not change (d) Boiling point does not change

    		•
  • Q : Solutions The normality of 10 lit.

    The normality of 10 lit. volume hydrogen peroxide is: (a) 0.176 (b) 3.52 (c) 1.78 (d) 0.88 (e)17.8

    		•
  • Q : Describe characteristics of halides and

    Halides characteristics

    		•
  • Q : Molar concentration of hydrogen 20 g of

    20 g of hydrogen is present in 5 litre of vessel. Determine he molar concentration of hydrogen: (a) 4  (b) 1 (c) 3 (d) 2 Choose the right answer from above.

    		•
  • Q : Question based on vapour pressure and

    Benzene and toluene form nearly ideal solutions. At 20°C, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The parial vapour pressure of benzene at 20°C for a solution containing 78g of benzene and 46g of toluene in torr is: (a) 50 (b)

    		•
  • Q : Problem on molarity-normality-molality

    Can someone please help me in getting through this problem. The solution ofAl2(SO4)3 d = 1.253gm/m comprise 22% salt by weight. The molarity, normality and molality of the solution is: (1) 0.805 M, 4.83 N, 0.825 M (2)

    		•
  • Q : Problem on moles of solution The number

    The number of moles of a solute in its solution is 20 and total no. of moles are 80. The mole fraction of solute wil be: (a) 2.5 (b) 0.25 (c) 1 (d) 0.75

    		•
  • Q : Dipole moment of chlorooctane

    Illustrate the dipole moment of chlorooctane?

    		•
  • Q : Kinds of insulators Describe all the

    Describe all the kinds of insulators which are present?

    		•