The ionisation energy of dioxygen (O_2) is very close to that of Xenon. Also F and O have the highest electronegativity and consequently can oxidise Xe among rare gases. So Xe forms a large number of compounds with F and O. Xe and F_2 are mixed and reacted at different temperatures to give XeF_2, XeF_4 and XeF_6. Xe also forms an unstable gaseous XeO_4 and soild XeO_3 which Is a very powerful explosive at higher temperatures .Some of the rare gases form clathrates or cage compounds by being entrapped in the cages of cystals laiitice of water, phenol of quinols. Helium can form intersitital compound with transition metals. Bigger members of rare gases do not form such compounds because of their large size. He and Ne do not from any clathrates because :

The ionisation energy of dioxygen (O_2) is very close to that of Xenon

1.	The ionisation energy of dioxygen (O_2) is very close to that of Xenon. Also F and O have the highest electronegativity and consequently can oxidise Xe among rare gases. So Xe forms a large number of compounds with F and O. Xe and F_2 are mixed and reacted at different temperatures to give XeF_2, XeF_4 and XeF_6. Xe also forms an unstable gaseous XeO_4 and soild XeO_3 which Is a very powerful explosive at higher temperatures .Some of the rare gases form clathrates or cage compounds by being entrapped in the cages of cystals laiitice of water, phenol of quinols. Helium can form intersitital compound with transition metals. Bigger members of rare gases do not form such compounds because of their large size. He and Ne do not from any clathrates because :
Answer» (A) He and NE are very large in size . (B) Being NEUTRAL they cannot from any POLAR BOUNDS with the host molecules. (C) Being too small , they cannot be entrapped in the cagesof water,phenol or quinol. (D) clathrates with He and Ne are HIGHLY expolsive. Answer :C