5. Please list the types of deals and name the grounds for their invalidity.

There are several types of deals that can be considered invalid, and the grounds for their invalidity can vary depending on the specific circumstances. Here are some common types of deals and the grounds for their invalidity:1. Unilateral Mistake: A deal can be invalid if one party makes a unilateral mistake of fact that is material to the agreement. For example, if one party mistakenly believes that a certain item is real when it is not, the deal may be invalid.2. Mutual Mistake: A deal can be invalid if both parties make a mutual mistake of fact that is material to the agreement. For example, if both parties mistakenly believe that a certain item is real when it is not, the deal may be invalid.3. Fraud or Deception: A deal can be invalid if one party engages in fraud or deception, such as misrepresenting a material fact or concealing a material fact with the intention to deceive the other party.4. Duress or Coercion: A deal can be invalid if one party is forced or coerced into entering the agreement against their will. This can occur through the use of physical force, threats, or other forms of pressure.5. Undue Influence: A deal can be invalid if one party takes advantage of their power or influence over the other party to obtain an unfair or unreasonable agreement.6. Lack of Capacity: A deal can be invalid if one or both parties lack the legal capacity to enter into a contract. This can occur if one party is a minor, mentally incompetent, or intoxicated at the time of the agreement.7. Lack of Consideration: A deal can be invalid if there is no consideration exchanged between the parties. Consideration refers to something of value that is exchanged between the parties, such as money, goods, or services. If there is no consideration, the deal may be invalid.It is important to note that these are just a few examples of the types of deals that can be invalid, and there may be other grounds for invalidity depending on the specific circumstances.