Three chemical differences between DNA and RNA

Three differences:

DNA and RNA are composed of repeated units. RNA is ribonucleotide monophosphates: and in DNA are 2 deoxyribonucleotide monophosphates.

The sugar in DNA is deoxyribose; the sugar in RNA is ribose. (Biggest difference between DNA/RNA)

And, finally,

Nitrogen bases of DNA: Adenine, Guanine, Cytosine, and Thymine.

Nitrogen bases of RNA: Adenine, Guanine, Cytosine, and Uracil.

These are the three main chemical differences between DNA and RNA.