Lapse and Revocation of offer – Illegality
An offer lapses by subsequent illegality or destruction of subject matter. An offer lapses if it becomes illegal after it is made, and before it is accepted. Thus, where an offer is made to sell 10 bags of wheat for Rs. 6,500 and before it is accepted, a law prohibiting the sale of wheat by private
individuals is enacted, the offer comes to an end. In the same manner, an offer may lapse if the thing, which is the subject matter of the offer, is destroyed or substantially impaired before acceptance.