Can some one please help me.

a) If i buy Bitcoin through Credit Card in USD and Sell in INR (on Indian exchanges ) i.e trading , so will thier be any problem with income tax/RBI ? becoz transaction size will be huge ,and lot of money money in and out of bank account. i am ok to pay taxes. But i am worried about FEMA/and other un-necessary torture by IT/RBI.

Please help. I am unable to get answer anywhere