Cash payment more than 10,000

I think 1,2,5 will attract

but in case 2 there are two payments for two different transactions

so, I cannot exactly say.

however, 40A(3) not mentioned about transaction, it says that 'if a payment is made above 10,000 in a day for any expenditure in any mode other than the 3 specified modes, then that expenditure is disallowed'

since the word any expenditure is used

case 2 attracts disallowance, as there is a payment of Rs. 13,000 to single party 

why not (5)

in 5 he splitted the 11,000 to 2 5,500 invoices

40A(3) text : Where the assessee incurs any expenditure in respect of which a payment or aggregate of payments made to a person in a day, otherwise than by an account payee cheque drawn on a bank or account payee bank draft, 18[or use of electronic clearing system through a bank account, exceeds ten thousand rupees,] no deduction shall be allowed in respect of such expenditure.

in 1,2,5 a person, a day, a payment or aggregate, any expenditure all the conditions are satisfied

therefore 1,2,5 attracts disallowance

Section 40A(3):-

Where the assessee incurs any expenditure in respect of which a payment or aggregate of payments made to a person in a day, otherwise than by an account payee cheque drawn on a bank or account payee bank draft, 18[or use of electronic clearing system through a bank account, exceeds ten thousand rupees,] no deduction shall be allowed in respect of such expenditure.

Based on application of Provision case 1,2,5 will be disallowed.

Neither in given Section it is mentioned that Limit of 10000 is per Bill nor it is mentioned that limit is per Expenditure.

Limit is per Person in a day. 

Sorry to some person but we have to apply section of any law based on general practices in law rather than own Interpretation of law.(per bill /per Expense 😂🤣😁😜  )