Why are certain compounds called hydrocarbons? Write the general formula for homologous series of alkenes and alkynes and also draw the structure of the first member of each series. Write the name of the reaction that converts alkenes into alkanes and also write a chemical equation to show the necessary conditions for the reaction to occur.

Explanation

Coulomb.s law. It states that two stationary electric point attract or repel each other with a force which is directly proportional to the product of magnitude of the charges and inversely proportional to the square of the distance between them.
Coulomb.s law in Vector form
Let `q_(1) and q_(2)` charges be separated by a distance r.
let `hat(r)_(12)`=unit vector pointing from `q_(1) ` to `q_(2)`
`hatr_(21)=` unit vector poiting from `q_(2)` to `q_(1)`
`vecF_(21)`= force exerted on `q_(2)` by `q_(1)`
`vecF_(12)`=force exerted on `q_(1)` by `q_(2)`

Then `vecF_(12)=(1)/(4piepsi_(0))(q_(1)q_(2))/(r^(2))hatr_(21)` . . . (i)
and `vecF_(21)=(1)/(4piepsi_(0))(q_(1)q_(2))/(r^(2))hatr_(12)`
or `vecF_(21)=-(1)/(4piepsi_(0))(q_(1)q_(2))/(r^(2))hatr_(21)` . . . (ii)
Adding (i), (ii), we get
`vecF_(12)+vecF_(21)=0`
or `vecF_(12)=-vecF_(21)`
Thus we find that coulomb.s law obeys newton.s third law of motion.