can a iPad (5th generation) use an apple pencil?

Sorry no.

Apple Pencil (1st generation)

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

• iPad (9th generation)
• 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

Not sure which iPad you have? Identify your iPad model.

No it can’t

To check what iPads use it, use this link. Apple Pencil compatibility - Apple Support

I was mistaken

Yes, it has support for the Apple Pencil 1st Generation