Which one of the following statements about water is false?

(i) Ice formed by heavy water sinks in normal water due to higher density of ${D}_{2}O$ than normal water

(ii) $6C{O}_{2} + 6{H}_{2}O\overset{hvchlorophyll}{→}{C}_{6}{H}_{12}{O}_{6} + 6{O}_{2}$

(iii) Water can show amphiprotic nature and hence water can act both as an acid a base

(iv) There is extensive intermolecular hydrogen bonding in the condensed phase instead of intramolecular H-bonding