Can somebody explain when to use If and when to use whether
like in question
This decade has seen no end to the controversy over if state-run day care centers are a necessary response to changes in employment patterns
if is not correct , whether is right option among answers
"If" is generally used for reasoning .. If/ then type of sentences... If this happens then this will happen.
Eg- If you finish your work by Five, you can leave early
and for Hypothetical sentences
Eg- If i work hard, I may get a good score in GMAT
"Whether" is used when we have choice between two options.
Eg-I need to decide whether i should Call her for the movie
I dont know whether i should study or go on my friends birthday
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