This chapter focuses on hydrocarbons, their classification, properties, and significance in everyday life.
Hydrocarbons – Formula & Equation Sheet
Essential formulas and equations from Chemistry Part - II, tailored for Class 11 in Chemistry.
This one-pager compiles key formulas and equations from the Hydrocarbons chapter of Chemistry Part - II. Ideal for exam prep, quick reference, and solving time-bound numerical problems accurately.
Key concepts & formulas
Essential formulas, key terms, and important concepts for quick reference and revision.
Formulas
C_nH_{2n+2}
This is the general formula for alkanes, where n is the number of carbon atoms. It helps identify the number of hydrogen atoms in a saturated hydrocarbon.
C_nH_{2n}
This is the general formula for alkenes, indicating that they have two fewer hydrogens than the corresponding alkane due to the presence of a double bond.
C_nH_{2n-2}
This is the general formula for alkynes, indicating that they have four fewer hydrogens than the corresponding alkane due to the presence of a triple bond.
CH_{4} + 2O_{2} → CO_{2} + 2H_{2}O
This is the combustion reaction of methane, showing that it reacts with oxygen to produce carbon dioxide and water, releasing energy.
C_{n}H_{2n} + H_{2} → C_{n}H_{2n+2}
This equation represents the hydrogenation reaction where alkenes add hydrogen to form alkanes, highlighting the saturation of the hydrocarbon.
C_{2}H_{4} + HBr → C_{2}H_{5}Br
This is an example of the electrophilic addition reaction where hydrogen halide adds to an alkene to form an alkyl halide.
C_nH_{2n+2} + Cl_{2} → C_nH_{2n+1}Cl + HCl
An example of halogenation, where chlorine gas reacts with an alkane resulting in the substitution of hydrogen with chlorine.
RCOOH + NaOH (soda lime) → RH + Na2CO3
This is a decarboxylation reaction used to form alkanes from carboxylic acids, highlighting the conversion process.
C_{n}H_{2n-2} + H_{2} → C_{n}H_{2n}
This represents the hydrogenation of alkynes to form alkenes, showing how unsaturation can be converted into saturation.
C_{n}H_{2n} + 2[H] → C_{n}H_{2n+2}
This formula indicates the reduction of alkenes or alkynes to their alkane form through hydrogenation.
Equations
C_{2}H_{4} + H_{2} → C_{2}H_{6}
Hydrogenation of ethylene to produce ethane, showcasing the addition reaction.
C_{3}H_{6} + Br_{2} → C_{3}H_{4}Br_{2}
This equation illustrates the addition of bromine to propene resulting in a vicinal dibromide.
C_{3}H_{8} + O_{2} → CO_{2} + H_{2}O
The general combustion reaction for propane, indicating complete oxidation.
C_{6}H_{6} + Cl_{2} → C_{6}H_{5}Cl + HCl
This equation shows the electrophilic substitution mechanism in benzene where a chlorine atom replaces a hydrogen atom.
C_{6}H_{5}COOH + NaOH → C_{6}H_{5}Na + H_{2}O
This reaction illustrates the formation of sodium phenolate when benzoic acid reacts with sodium hydroxide.
RCHO + [H] → RCH_{2}OH
This reaction depicts the reduction of an aldehyde to an alcohol.
C_{2}H_{2} + 2H_{2} → C_{2}H_{6}
The conversion of ethyne to ethane through hydrogenation.
RCOOH + NaOH → RH + Na2CO3 (decarboxylation)
The decarboxylation reaction where a carboxylic acid is converted to a hydrocarbon.
RC \equiv C - H + [H] → RCH = CH2
This reaction illustrates the hydrogenation of a terminal alkyne to an alkene.
C_nH_{2n-2} + 2[H] → C_nH_{2n}
The addition of hydrogen to alkynes to form alkenes.
This chapter explores redox reactions, which involve the simultaneous processes of oxidation and reduction. Understanding these reactions is crucial for various scientific and industrial applications.
Start chapterThis chapter introduces essential concepts in organic chemistry, focusing on the principles, techniques, and reactions involving organic compounds. Understanding these concepts is crucial for studying more complex organic chemistry topics.
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