Consider the following sentences; i. The plan to evacuate the area won’t work out as there aren’t enough vehicles to drop everyone off at the safe zone. ii. Rohit went ballistic after his brother cocked up his plan to attend the long-awaited event. iii. I want this cleaned immediately. iv. I penalized some of the employees for being always late. Which of the above can be used in a formal conversation? Revise the ones which you feel cannot be used in a formal conversation.

In a formal conversation, it's important to use language that is polite and professional. Among the provided sentences:

i. "The plan to evacuate the area won't work out as there aren't enough vehicles to drop everyone off at the safe zone."
ii. "Rohit went ballistic after his brother cocked up his plan to attend the long-awaited event."
iii. "I want this cleaned immediately."
iv. "I penalized some of the employees for being always late."

The sentences that may not be suitable for a formal conversation are:

ii. "Rohit went ballistic after his brother cocked up his plan to attend the long-awaited event."
iv. "I penalized some of the employees for being always late."

Revised versions for a formal conversation:

i. "The plan to evacuate the area may face challenges as there might not be sufficient vehicles available to transport everyone to the safe zone."
iii. "I would appreciate it if this could be cleaned promptly."

These revised sentences maintain a more formal and professional tone, which is appropriate for formal conversations.