810 ILCS 5/2-601: Buyer's rights on improper delivery.

Subject to the provisions of this Article on breach in installment contracts (Section 2-612) and unless otherwise agreed under the sections on contractual limitations of remedy (Sections 2-718 and 2-719), if the goods or the tender of delivery fail in any respect to conform to the contract, the buyer may

(a) reject the whole; or

(b) accept the whole; or

(c) accept any commercial unit or units and reject the rest.