Discussion
Alkali metals form strong complexes with cryptate ligands. The structure of one such crypt given below is of :
Answer: C
It is 2.2.2 crypt ([2.2.2]cryptand).
Cryptands are named by the number of oxygen atoms in each of the three bridges joining the two bridgehead nitrogens. Here every bridge is -CH2CH2OCH2CH2OCH2CH2- and holds two oxygens, so the ligand is [2.2.2]. It encloses a metal ion in a three-dimensional cage, which is why its alkali-metal complexes are so stable; its cavity suits K+ best.
4.2.2, 6.2.2 and 8.6.2 would need bridges with four, six or eight oxygens, which the drawn ligand does not have.
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