Question

the I.R frequency of c=o group in dichloro acetone increase as compare to acetone because
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Answer 1

Answer:

of higher densit

Answer 2

The C=O group 3 to 30cm⁻¹ increases because it interpreted four components.

Explanation:

The spectrum of this four-component mixture can be interpreted from a knowledge  of the components – acetone, methanol, dichloro molecular ion (carbonate, sulfate, nitrate, ammonium,  etc.) or a covalent species (chloroform, dichloromethane, methanol, water, etc.).

Having determined  this, it is worthwhile to reflect on the complexity of the  spectrum, and to see if one or two characteristic functionalities, associated with simple functional groups (OH,  NH, C=O, etc.) are present. Often, the like-to-like rule  applies – that is, a simple spectrum is usually indicative of  a simple molecular structure, and vice versa.