Are the following transactions valid to be considered as Bills of Exchange? Specify why or why not.

i. We hereby authorize you to pay on our account to the order of Kwame an amount of 150,000

ii. Pay Abena 250,00 on her marriage to Kojo

iii. Pay Christian 30,000 and debit a/c 101A102000312 with ABC Bank Ltd

iv. Pay Mitch 920,000 upon the death of his father

v. Pay Ama 200,000 from the proceeds of the sale of my car

vi. Pay Kofi 100,000 when Johnnie Walker completes his charity walk from Bawku to Accra