Question

A. Uses of alkenes
B. Ozonolysis of ethene
C. Bayer’s test
D. Uses of alkynes

Answer 1

Hint: Generally, organic compounds are used in a variety of applications. Octane, for example, is used as a fuel in aviation. In Ozonolysis, the term ‘lysis’ means breaking down. There are certain tests that detect unsaturation. Unsaturation means double or triple bonds are present in the compound.

Complete step by step solution:
A.Uses of alkenes: Alkenes are compounds that have double bonds and mostly are used in preparation of plastics. That is why plastics are said to be unsaturated. The plastics are very good insulators of electricity. Apart from plastics, they are also used in paints, in synthesis of alcohols and also as a starting material for fuels.
B.Ozonolysis of ethene: Ozonolysis is an organic reaction where cleavage of the unsaturated bond takes place, in presence of oxygen. In alkenes, ozonolysis replaces the double bond of carbon with a carbonyl group. The ozonolysis of ethene looks like:

C.Baeyer's Test: Baeyer's test is a test in organic chemistry which detects the compounds that are double or triple bonded, or basically unsaturated. In Baeyer's test, dilute potassium permanganate is used as a reagent. When reacted with alkenes, a di-ol is produced and when reacted with alkynes,4-hydroxy quattrol is produced.

D.Uses of alkynes: Alkynes are those chemical compounds that have at least one triple bond between the carbon atoms. The most common use of alkynes include preparation of organic compounds like ethanol, ethanoic acid, etc. Like alkenes, alkynes are also used as starting materials for polymers and for preparing organic solvents.

NOTE: During the Baeyer's test, along with dilute $KMn{{O}_{4}}$, some amount of water is also used. Along with the diol as a major product, we also get traces of a brown solid called manganese dioxide $Mn{{O}_{2}}$.