What are the predominant forces that must be overcome in the changes below: $($SM$2,$ p$429,$ Q$62)$

$($a$)$ Sublimation of solid $C_{10}{H}_8.$

$($b$)$ Melting of propane, $C_3{H}_8.$

$($c$)$ Decomposition of water into $H_2$ and $O_2.$

$($d$)$ Boiling of $PC{l}_3.$

$($e$)$ Evaporation of water.