Electrophilic addition: In this addition reactions, an electrophile attack on double bond of alkene to form an intermediate carbocation and convert one of the pi bond to sigma bond. In second step the counter ion attacks on this intermediate to form saturated hydrocarbon as product.
Ketu is the reflection of all the baggage of values and motives that we have brought into this birth. With a proper study of the placement of Ketu in a Birth-Chart, we can also get a hint or an idea that in what area a person is bound to perform well and where his interests and inclinations lie in the current birth.
The planet Ketu also forms various bad Yogas when it is in conjunction with other planets. Ill-placed Ketu also provides many bad results in the life of native just like Rahu but the intensity of the bad results are lower in comparison to Rahu.