why i am getting error?

Question

In Sql Server when i run query : 

Select Case when 5>2 then 1

          else 2 end

its working perfectly, But when i run the below query its showing error ? 

 

Query : Select 5 > 2

 

Output:

Msg 102, Level 15, State 1, Line 17

Incorrect syntax near '>'.

 

Why error ? instead of displaying True or false or 1 or 2? on comparison .