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(a) Statement -I and II are correct and statement – II is correct explanation of statement-I

Liquefied petroleum gas consist of a mixture of Propane + butane

Mangoes contain Cyclo hexane.

Wurtz reaction used in the preparation of higher alkanes.

Polymerization is a process in which a large number of simple molecules combine together to form big molecules. The simple molecules are called monomers and the big molecules are called polymers.

When phenol reacts with Zn-dust under dry distillation conditions it gives Benzene.

Benzene contains a bonds and it bonds 12,3.

Wurtz-fittig reaction helps to prepare compounds aromatic.

When an unsymmetrical alkene reacts with hydrogen halide, the hydrogen atom adds to the carbon atom that has more number of hydrogen atoms and halogen add to the carbon atom having fewer hydrogen atoms.

Ozonolysis of acetylene gives HCOOH.

Electrophilic substitution

Ozonolysis of ethene produces HCHO.

Physical properties:

• Aromatic hydrocarbons are non- polar molecules and are usually colourless liquids or solids with a characteristic aroma.
• Aromatic hydrocarbons are immiscible with water but are readily miscible with organic solvents. 
• They burn with sooty flame. 

The restricted rotation around carbon to carbon double bond.

Cracking is a process of breaking higher hydrocarbons by heating.

The trade name of Benzene Hexacarbon is Gammaxane.

When propyl chloride is heated with alcoholic potash propene is obtained.

• Alkynes are aliphatic unsaturated hydrocarbons containing at least one C = C
•  Their general formula is C_nH_{2n - 2}. .

a .Pent-en-3-yne 

b. 2-methylphenol

When a mixture of ethene and hydrogen is passed over heated nickel catalyst at 200°C, ethane is obtained.

Alkyl magnesium halides.

Chemical properties :

Arenes are characterised by electrophilic substitution reactions proceed via the following three steps:

Generation of the eletrophile.

Formation of carbocation intermediate.

Removal of proton from the carbocation intermediate. 

2 – bromopropane.

Alkynes are unsaturated aliphatic hydrocarbons containing one carbon to carbon triple bond.

Correct option is: (A) addition

Alkynes readily undergo addition reaction

Correct option is (A) addition

Correct option is: (B) sodamide

\(\underset {Dihalogen\, Derivatives }{{R- H \underset {Cl}{\underset |C}} - \underset {Cl}{\underset |C}H- R} + \underset {Sodamide}{Na\, NH_2} \rightarrow \underset {Alkyne} {R-C\equiv C-R} + 2Na\, Cl + 2NH_3 \)

Correct option is (B) sodamide

The general formula of alkynes : C_nH_2n-2

It is unsaturated in nature.

The state of hybridisation of carbon atoms in alkenes is sp².

The carbon-carbon double bond in alkene contains one sigma bond and one pi-bond. The Pibond involves the overlapping of unhybridised p orbital of two carbon atom .The rotation around the carbon-carbon double bond is only possible only if Pi bond breaks. The breaking of pi bond required 251KJ/M energy which is not provide by the molecular collision at room temperature .Therefore ,the atom or group attached to the double bonded carbon atoms cannot rotate about. In other words, the free rotation around C=C double bond is restricted, which gives rise to Geometrical Isomerism.

Due to presence of C = C & C ≡ C bonds respectively.

Reaction carried in the presence of light.

• In organic chemistry, a hydrocarbon is an organic compound consisting of carbon and hydrogen as the only elements.
• They are examples of group 14 hydrides.
• Alkanes, cycloalkanes, aromatic hydrocarbons are different types of hydrocarbons.
• Most of the hydrocarbons found on earth occur naturally in crude oil.
• They mainly undergo substitution, addition or combustion reactions.
• Most hydrocarbons are flammable and toxic.
• They are the primary energy source in the form of combustible fuel source. 

Correct option is: (C) insoluble

Alkane are non-Polar and water is Polar molecule as we know like dissolve like.

Thus, Alkanes are insoluble in water

Correct option is (C) insoluble