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You don't connect the extra pins - just the two with the crystal connections. For a PCB you would add pads for the extra two pins but they would not be connected to anything.
Shall i connect the rest of two pads to ground.
or short them to crystal pins ? as i have seen this is been done in a reference design, but doesn't know the logic behind this
If it doesn't say on the data sheet to ground the 2 spares then don't - they probably aren't connected to anything anyway. Some crystals in metal cans have them grounded. Certainly don't connect them to the crystal pins.
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