Question

An organic compound on heating changes directly into vapors without undergoing into liquid state, it is insoluble in water and is commonly used to prevent clothes against moths. It is contaminated with cinnamaldehyde. Suman, a student of class $XI^{th}$ was asked by his teacher how to purify it. Now answer the following questions:
(i) Which method of purification would suman apply?
(ii) Name the compound and write it’s another use.
(iii) Write the value associated with this.

Answer 1

The substance on heating changes directly into vapor without undergoing into liquid state is called sublimation. The organic compound mentioned in this question is naphthalene. It is insoluble in water and usually used to prevent clothes against moths and cockroaches. It is always contaminated with cinnamaldehye.

i) The method used for the purification of naphthalene is sublimation.

ii) The name of compound is naphthalene. It is also used for making resins, leather tanning agents, dyes, etc.

iii) The scientific value is associated with this organic compound naphthalene.