Exemtion u/s 54 on capital gain

I have bought a residential land plot in 2011 for Rs. 40L. Now I plan to sell it at Rs. 80L Thereby getting a capital gain of Rs. 20L. (adjusted for inflation etc.) I am planing to but a flat of Rs. 50 L and a plot of Rs. 40 L with this proceeds and some of my money. Will I get exemption U/s 54 on my capital gain of Rs. 20 L or not? If not then what should I do??