Carbon and its Compounds (Class-X)

Compounds made of Hydrogen and Carbon are called Hydrocarbons.

Catenation is the ability of carbon atoms to form long chains or rings by bonding with other carbon atoms.

Saturated hydrocarbons, which contain only single bonds between carbon atoms, are called alkanes.

In a homologous series, each successive member differs from the previous one by a CH2 unit.

A functional group is a specific group of atoms within a molecule that is responsible for the characteristic chemical reactions of that molecule.

Power alcohol is a blend of petrol (gasoline) and ethyl alcohol (ethanol) used as a motor fuel.

The free radical substitution reaction of alkanes with halogens is initiated by light, typically diffused sunlight, to control the reaction rate.

Friedrich Wohler synthesized urea from ammonium cyanate in 1828, which was the first time an organic compound was produced from inorganic materials.

Isomers are compounds with the same molecular formula but different structural arrangements. Butene-1 and butene-2 are structural isomers due to the position of the double bond.

Cyclobutane, cyclopropane, and cyclopentane are all examples of cyclic carbon compounds (cycloalkanes).

Unsaturated hydrocarbons with a high carbon-to-hydrogen ratio, such as ethyne (acetylene), burn with a yellow sooty flame due to incomplete combustion.

Glacial acetic acid is pure acetic acid (100%) with no water content. The term 'glacial' refers to its tendency to form solid ice-like crystals at temperatures below 16.6°C. It is not a mixture.

Complete combustion of hydrocarbons produces carbon dioxide (CO2) and water (H2O). This is the balanced equation: CxHy + (x + y/4)O2 → xCO2 + (y/2)H2O. Carbon monoxide (CO) is a product of incomplete combustion.

Soap molecules form clusters called micelles in water. These micelles are large enough to scatter light, which is known as the Tyndall effect, giving the solution a milky appearance.

Heating ethanol with concentrated sulfuric acid acts as a dehydrating agent, removing a water molecule to form ethene. This is a classic dehydration reaction.

Hard water contains calcium and magnesium ions. When soap is used with hard water, these ions react with soap to form insoluble calcium and magnesium salts of fatty acids, appearing as curdy white precipitates.

Propanone is a ketone with the formula CH3COCH3. The functional group characterizing ketones is the carbonyl group bonded to two carbon atoms.

n-Pentane and isopentane have the same molecular formula (C5H12) but different structural arrangements of their carbon chains. Therefore, they are structural isomers.

The reaction between a carboxylic acid and an alcohol is called esterification. It produces an ester, which typically has a sweet, fruity smell, and water.

The primary alcohol found in fermented beverages like wine and beer is ethanol, also known as ethyl alcohol.

Soap is made by saponification, which requires vegetable oil (or animal fat) and a strong base like sodium hydroxide. Sodium chloride is used to salt out the soap from the solution.

A detergent molecule has a long hydrocarbon chain that is hydrophobic (water-repelling) and an ionic head that is hydrophilic (water-attracting).

Converting ethene (an unsaturated hydrocarbon) to ethane (a saturated hydrocarbon) involves adding hydrogen across the double bond. This is a classic addition reaction.

Both alkaline potassium permanganate (KMnO4) and acidified potassium dichromate (K2Cr2O7) are strong oxidizing agents that can convert primary alcohols to carboxylic acids. Sulfuric acid (H2SO4) is typically used as a dehydrating agent or catalyst, not as an oxidizing agent for this conversion.