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The infrared frequency of the CX vibration for CH3X depends on which of the following?...

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The infrared frequency of the CX vibration for CH3X
depends on which of the following?
       I.   mass of X   
       II.  strength of the CX bond
       III. type of CX vibration (stretch or bend)

(A)  I. only 

(B)  II. only
(C)  II. and III. only 

(D)I., II. and III.

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The infrared frequency of the CX vibration for CH3X 
depends on all the three: mass of X, strength of C-X bond and type of CX vibration (stretch or bend). It is a rather straightforward question, which just requires proper study. You can find more about it on research paper. You could also find some information, not complete, in a book by Raymond Chang about chemistry.

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