eXCEL COMPARISON SIMPLIFIED

I have two sheets

sheet1 has col1, col2, col3, col4

and

Sheet2 has col1, col2, col3, col4

The data in both the sheets is sorted as col2, col1

I want to run a comparison on two sheets, I want find the records missing in sheet2 that are present in sheet 1

We need to comapre col1

Example of data in sheet 1

col1, col2, col3, col4
a.b    d         1      1
d.c    d          2      1
E.F    D
w.s   e    
e.d    e           1     1


Example of sheet2
col1, col2, col3, col4
a.b    d         1      1
w.s   e    


FINAL SHEET1 SHOULD LOOK LIKE THIS
col1, col2, col3, col4  COL5
a.b    d         1      1
d.c    d          2      1     MISSING
E.F    d                         MISSING
w.s   e    
e.d    e           1     1    MISSING



pLEASE NOTE i AM NOW COMPARING ONLY cOL1 FROM SHEET1 TO COL1 FROM SHEET2
No idea how to do it in excel.