Determine the number and symmetry designations of the infrared-active C-O modes in the following derivatives of Mo(CO)_6-

Mo(CO)₅PR₃

cis-Mo(CO)₄ (PR₃)₂

trans-MO(CO)₄ (PR₃)₂

fac-Mo(CO)₃ (PR3)₃

1. Mo(CO)₅PR₃:

   • This complex has C₄v symmetry.
   • The CO stretching vibrations _______ _________ _____ ___ __________ ___ ____ ___ _______.
     __________ _____ ____ _____ _____.
     ____ ____ _________ ____ _____ _______ __________ __________ ________ __________ __________.
     _____ ___ ______ ___ __________ _______ ___ ______ _____ __________ ___.
     _____ _____ ________ _________ ______ ____.
     __________ ____ __________ _____ ______.
     ________ _________ ____ ___ ______ ____ ________ ________ _________ ______ __________.
     ________ _________ __________ _________ ________ _________.
     ____ _____ ____ ________.
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