State which of the following agreements are valid contract under the Indian Contract Act, 1872? a) A, who owns two cars is selling red car to B. B thinks he is purchasing the black car. b) A threatened to shoot B if he (B) does not lend him `2,00,000 and B agreed to it. c) A agrees to sell his house to B against 100 kgs of cocaine (drugs). d) A ask B if he wants to buy his bike for ` 50,000. B agrees to buy bike. e) Mr. X agrees to write a book with a publisher. But after few days, X dies in an accident.

a) A, who owns two cars is selling red car to B. B thinks he is purchasing the black car. There is no consensus ad idem and hence not a valid contract. b) A threatened to shoot B if he (B) does not lend him `2,00,000 and B agreed to it. Here the agreement is entered into under coercion and hence not a valid contract. c) A agrees to sell his house to B against 100 kgs of cocaine (drugs). Such agreement is illegal as the consideration is unlawful. d) A ask B if he wants to buy his bike for ` 50,000. B agrees to buy bike. It is agreement which is enforceable by law. Hence, it is a valid contract. e) Mr. X agrees to write a book with a publisher. But after few days, X dies in an accident. Here the contract becomes void due to the impossibility of performance of the contract.