Hello there

I cannot tell you whether it is good for girls or not as there is no gender requirements made by companies while selecting candidates .petrochemical engineering is a good course and the salary is also quite good in india .There are many public and private companies in india where you can be hired .Some of them are

ONGC

HPCL

BPCL

TATA Chemicals

HOEC

GAIL

..And others

Yes there are quite good opportunities in petrochemical engineering . Subject might vary from college to college so checkout the syllabus of the particular college you are interested in

Try researching more on this topic to get assured before closing any path