You can use O.P Tondon for organic chem. according to me.coz i have this book arihant as well as JPNP prakashan's book.The best i feel is this.If you are anew user never go for arihant because this book is completely based on line formulae which makes a new user confused in the same way I was. JPNP's is good but better is O.P Tondon.