Question

which property of naphthalene is mainly responsible to use it as moth ball

Answer 1

Moth balls are insecticides that are used to kill insects such as moths in clothes during storage and/or transportation.

Moth balls come in a solid form that slowly sublimes to give off the toxic gas of the compound or element that forms it. 

Naphthalene and Paradichlorobenzene are two common substances used in these moth balls. These form of insecticides can also come in the form of crystals and bars instead of balls. 

The main reason naphthalene is used in moth balls, is because of its ability to sublime, that is, directly turn from a solid phase to a gas state without passing through the liquid state - and this takes place at lower temperatures and pressure. 

One more reason the naphthalene is used is because the fumes it emits is toxic to insects such as moth and thus can act as an insecticide.