Can i use Apple pencil generation 1 for ipad air 2?

No.

Apple Pencil (1st generation)

You can use Apple Pencil (1st generation) with these iPad models:

• iPad (8th generation)
• iPad mini (5th generation)
• iPad (7th generation)
• iPad (6th generation)
• iPad Air (3rd generation)
• iPad Pro 12.9-inch (1st or 2nd generation)
• iPad Pro 10.5-inch
• iPad Pro 9.7-inch

No.

No Apple Pencil’s work with any older iPads, like the 2014 iPad Air 2.

No iPads made before late 2015 can use an Apple Pencil.

Sorry.