Bond type and strength

Question 1

Why are alkyl halides polar?

Answer 1

Halogens are more electronegative than carboh and hence attract shared electron pair towards themselves causing C to develop partial +ve charge and Halogens develop -ve charge.

Question 2

C-X bond strength decreases with increase in size of halogen

Answer 2

With increase in atomic number, size of p-orbital increases, it becomes more diffused and extent of over lap decreases thus decreasing bond strength.

Question 3

Boiling Point

Why does boiling point increase with increasing atomic mass

Answer 3

Magnitude of van der Waals forces increases with increase in mass.
Order of boiling points is :-
RI>RBr>RCl>RF

Question 4

Boiling Point

How does boiling point of different haloalkenes with same halogen group change?

Answer 4

Boiling point increases with increase in number of carbon atoms

Question 5

Boiling Point

Why does boiling point of alkyl halides decrease with branching

Answer 5

Upon branching, surface area of molecules increases, decreases the magnitude of van der Waals forces, thus decreasing the boiling point.

Question 6

Alkyl Halides are immiscible in water. Why?

Answer 6

Alkyl halides cannot form hydrogen bonds as attraction betewwn alkyl halide molecules is stronger than attraction between alkyl halide and water.