Which type of offer cannot be accepted due to certain conditions?

An invalid offer is defined as one that cannot be accepted because it fails to meet the essential requirements of a valid contract, such as clarity and legality. Offers may be considered invalid for various reasons, including lack of intention to create legal relations, uncertainty, or illegality. Since an invalid offer lacks the necessary legal specifications, it cannot result in a binding agreement when accepted.

In contrast, a conditional offer, as suggested, is based on certain conditions being met for acceptance; however, it remains a valid offer as long as the conditions are clearly stated. An implied offer arises from the conduct of the parties involved rather than explicit terms and can also be accepted if the conditions of the implied understanding are fulfilled. A revocable offer refers to a situation where the offeror can withdraw the offer before it is accepted, but until such revocation occurs, it remains available for acceptance.

Thus, the distinction lies in the foundational legality and clarity of an invalid offer, making it non-acceptance as it inherently lacks the qualities necessary to form a contract.