(i) Take the given sample solution in a test tube.
(ii) Add a few drops of bromine water and observe any characteristic change in colour
(iii) If the given compound is unsaturated it will decolorise bromine water. Saturated compounds do not decolorise bromine

Detergents are better than soaps because they,
(i) can be used in both hard and soft water and can clean more effectively in hard water than soap.
(ii) can also be used in saline and acidic water.
(iii) do not leave any soap scum on the tub or clothes.
(iv) dissolve freely even in cool water and rinse freely in hard water.
(v) can be used for washing woollen garments, where as soap cannot be used.
(vi) have a linear hydrocarbon chain, which is biodegradable.
(vii) are active emulsifiers of motor grease.
(viii) do an effective and safe cleansing, keeping even synthetic fabrics brighter and whiter.

Characteristics of hydrocarbons
(i) Lower hydrocarbons are gases at room temperature
(ii) Alkanes are least reactive where Alkynes are most reactive due to presence triple bond
(iii) Alkanes are saturated whereas alkenes and alkynes are unsaturated
(iv) They are insoluble in water

Hydrocarbons are classified into three classes such as:
(i) Alkanes
(ii) Alkenes
(iii) Alkynes
(i) Alkanes: These are hydrocarbons which contain only single bonds. They are represented by the general formula C_nH_{2n + 2} (where n = 1,2,3, ).
Ex: Methane (CH₄).
(ii) Alkenes: The hydrocarbons which contain one or more C=C bonds are called alkenes. These are unsaturated compounds. They are represented by the general formula C_nH_2n.
(iii) Alkynes: The hydrocarbons containing carbon to carbon triple bond are called alkynes. They have the general formula C_nH_2n-2.
Ex: Acetylene (C₂H₂)

(i) Organic compounds have high molecular weight and complex structure
(ii) They are mostly insoluble in water and soluble in organic solvents such as ether, carbon tetrachloride, toluene, etc.
(iii) They are highly flammable.
(iv) Organic compounds are less reactive compared to inorganic compounds.
(v) Organic compounds form covalent bonds.
(vi) They have lower melting point and boiling point.
(vii) They exhibit the phenomenon of isomerism.
(viii) They are volatile in nature.
(ix) They can be prepared in the laboratory.