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What’s the difference between “if” and “in case”
It is important not to confuse “if” and “in case”. They can be used in similar sentences, but they have different meanings. Consider the following examples:
 I will take a coat if it rains.
 I will take a coat in case it rains.
Here, “if” is used to present a conditional situation (dependent it raining), while “in case” is a precaution (done to prepare for the rain).
“In case” is usually used to show that an action is being taken, or preparations have been made, as a precaution – so the action or event is completed based on a possibility.
 I have bought extra porridge in case we need more.
 He was expecting a delivery, so he stayed at home in case it arrived.
“If”, as a conditional, shows an action or event that is dependent on something else happening. The action will not happen unless the if clause happens.
 I will go to the play if I have some spare time.
 She will receive a reward if she passes her exam.