2.5.2 Alkanes and Alkenes

• The general formula for alkanes is CₙH₂ₙ₊₂, while for alkenes it is CₙH₂ₙ
• Match the feature with the correct hydrocarbon:

  Bond Type ↔️ Single bonds ||| Double bond

  Saturation ↔️ Saturated ||| Unsaturated

  Reactivity ↔️ Less reactive ||| More reactive

  General Formula ↔️ CₙH₂ₙ₊₂ ||| CₙH₂ₙ
• The general formula for alkenes is CₙH₂ₙ
• Alkanes are saturated hydrocarbons with the general formula CₙH₂ₙ₊₂
• The bond type in alkanes is single, while in alkenes it is at least one double
• Alkenes follow the general formula CₙH₂ₙ


  True
• Alkenes contain at least one double bond and are unsaturated

  True
• Arrange the following features of alkanes and alkenes in the correct order of comparison:

  1️⃣ Bond Type

  2️⃣ Saturation

  3️⃣ Reactivity

  4️⃣ General Formula
• The bond type in alkanes is single, while in alkenes it is at least one double
• Arrange the following features of alkanes and alkenes in the correct order of comparison:

  1️⃣ Bond Type

  2️⃣ Saturation

  3️⃣ Reactivity

  4️⃣ General Formula
• Alkanes are more reactive than alkenes.

  False
• Alkenes are less reactive than alkanes.

  False
• The suffix for alkanes is -ane.
• The IUPAC name for CH₃-CH=CH-CH₃ is But-2-ene.
• Match the property with the correct hydrocarbon:

  Alkanes ↔️ Low reactivity

  Alkenes ↔️ High reactivity
• What type of bonds are found in alkanes?

  Single bonds
• Alkanes are saturated hydrocarbons.
• Alkanes contain only single bonds, making them saturated
• Alkanes have only single bonds, making them less reactive
• Alkanes are saturated hydrocarbons with the general formula CₙH₂ₙ₊₂
• Match the feature with the correct hydrocarbon:

  Bond Type ↔️ Single bonds ||| Double bond

  Saturation ↔️ Saturated ||| Unsaturated

  Reactivity ↔️ Less reactive ||| More reactive

  General Formula ↔️ CₙH₂ₙ₊₂ ||| CₙH₂ₙ
• Alkanes and alkenes differ in their bond types and saturation levels


  True
• Match the hydrocarbon with its general formula:

  Alkanes ↔️ CₙH₂ₙ₊₂

  Alkenes ↔️ CₙH₂ₙ
• The bond type in alkanes is single, while in alkenes it is at least one double
• Alkanes are saturated hydrocarbons with the general formula CₙH₂ₙ₊₂
• Alkanes are saturated hydrocarbons, while alkenes are unsaturated

  True
• What type of bond is found in alkanes?

  Single bond
• What is the key difference between alkanes and alkenes in terms of bonding?

  Double bond
• Match the hydrocarbon with its general formula:

  Alkanes ↔️ CₙH₂ₙ₊₂

  Alkenes ↔️ CₙH₂ₙ
• In alkanes, each carbon atom must have four bonds.


  True
• What type of reactions do alkanes primarily undergo?

  Combustion, Substitution
• Alkanes are saturated hydrocarbons.

  True
• Alkenes are saturated hydrocarbons.

  False
• What is the general formula for alkanes?

  CₙH₂ₙ₊₂
• What is the general formula for alkenes?

  CₙH₂ₙ
• Alkanes have single bonds, while alkenes have at least one double bond
• What is the general formula for alkanes?

  CₙH₂ₙ₊₂
• Steps to name alkanes and alkenes

  1️⃣ Identify the longest chain of carbon atoms

  2️⃣ Number the chain from the end closest to substituents or the double bond

  3️⃣ Name the compound using prefixes and suffixes

  4️⃣ Indicate the position of double bonds with numbers

  5️⃣ Include any substituents at their correct positions
• Steps to draw alkanes and alkenes

  1️⃣ Draw the carbon chain

  2️⃣ Add hydrogen atoms to ensure each carbon has four bonds

  3️⃣ In alkenes, place a double bond in the appropriate position

  4️⃣ Include substituents where necessary
• Alkanes have lower boiling points than alkenes with the same number of carbon atoms.


  True