The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The organic chemistry is studied separately because of its huge no. of compounds formed by catenation and multiple bond formation. Organic compounds are growing in numbers because, the hetero atoms like N,O,S etc attached to hydrocarbon to give large number of compounds which could not be studied in one stream with its reaction mechanism and application, so they studied separately.