Question

the melting and boiling points are​

Answer 1

Answer:

when an elememt statrts to melt at a temperature this point is called melting points.

When an element starts to boil at a temperature this point is known as boiling point

Answer 2

$\huge\red{\boxed{\bold{Answer}}}$

$\large\underline\mathrm\blue{(a). \: Haloalkanes:-}$

Haloalkanes have higher boiling point as compared to those of corresponding alkanes. This due to their polarity and strong dipole - dipole attractive interactions between haloalkane molecules.

The boiling point of haloalkanes are in the order RCl < RBr < RI. It is because with the increase in size and mass of the halogen atom the magnitude of van der Waal forces of attraction increase.

$\large\underline\mathrm\blue{(b). \: Density:-}$

Bromo, iodo and polychloro derivatives of hydrocarbons are heavies than water. The density increases with increases in number of carbon atoms, halogen atoms and atomic mass of the halogen atoms.

$\large\underline\mathrm\blue{(C). \: Solubility:-}$

Haloalkanes and haloarenes are covalent compounds hence they are practically insoluble in water because they are not able to form hydrogen bonds with molecules. They are soluble in organic solvents.

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