Which from following statements is NOT true for nucleic acids?

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In nucleic acids, the backbone is formed by alternating sugar and phosphate groups. The linkage connecting the nucleotides is a phosphodiester linkage, which involves a $- C - O - P - O - C -$ sequence of atoms, not a $- C - O - C -$ linkage.

The $5^{'}$ end of a polynucleotide chain has a free phosphate group, and the $3^{'}$ end has a free $- OH$ group.

Neighbouring nucleotides are joined together by phosphodiester bonds.

Therefore, the statement that nucleic acids contain a backbone formed of $- C - O - C -$ linkage is incorrect.

Answer: Nucleic acids contain back bone formed of $- C - O - C -$ linkage.

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