please suggest me some easy to mine and profitable coin that can be exchanged for bitcoin..i want to earn like 0.005BTC per day via mining
That's like taking a shower without getting wet.
If there is a profitable coin, it's not easy to mine as many other miners will also mine it and you compete with all of them.
Being profitable can either be achieved with a lot of hashpower (private mining farm) on coins with a more or less stable coin
or mining less profitable coins on stock and selling them during a pump or a general price increase (so you need to do som research which coin have potential).
So that means you have to invest money/time? Yes, nobody said mining is an easy profit machine
Just my 2 satoshi