"If" is used in conditional constructions.
- If it rains, then we won't go to the park.
- He says he'll come to the party if and only if she comes too.
Whether
"Whether" is used to express doubt or to indicate choices or possibilities .
- I don't know whether they were invited.
- I had to decide whether or not to respond to his letter.
- Maria asked whether I preferred Greek or Italian food.
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