wanted to ask you that wether is there any rule to write oh and h in general closed structure of glucose and fructose or randomly we can write anywere up or down whatever we wish

Dear student,                    
Please find below the solution to the asked query         
                               
The position of OH and H is fixed in different types of structures of glucose or fructose. So, you cannot write them randomly. Fischer projection Haworth structure of glucose is as follows:

The conversion of glucose from Fischer projection to Haworth involves a transfer of OH group.
                   

Hope this information will clear your doubts about the topic.   
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Regards                                   

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what? can you be more clear...
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