$CATEGORY: Science - Khan Academy/4.Carbon and its Compounds/4.Carbon and its Compounds--Versatile Nature Of Carbon

//Multiple Choice

What is the general molecular formula of alkanes? {
    =CnH2n+2
    ~CnH2n
    ~CnH2n-2
    ~CnH2n+1
}

What is the general molecular formula of alkenes? {
    ~CnH2n+2
    =CnH2n
    ~CnH2n-2
    ~CnH2n+1
}

What is the general molecular formula of alkynes? {
    ~CnH2n+2
    ~CnH2n
    ~CnH2n-2
    ~CnH2n+1
}

Which type of bond is characteristic of alkenes? {
    ~Single bond
    =Double bond
    ~Triple bond
    ~Ionic bond
}

Which of the following is an example of an alkane? {
    ~Ethene
    =Ethane
    ~Ethyne
    ~Benzene
}

Which of the following hydrocarbons belongs to the alkyne series? {
    ~Methane
    ~Ethene
    =Ethyne
    ~Propane
}

What type of bonds are present in alkynes? {
    ~Only single bonds
    ~One double bond and single bonds
    =One triple bond and single bonds
    ~Only triple bonds
}

Which series of hydrocarbons is saturated? {
    =Alkanes
    ~Alkenes
    ~Alkynes
    ~Aromatics
}

Which of the following compounds has the molecular formula C3H4? {
    ~Propane
    ~Propene
    ~Propyne
    ~Propadiene
}

Which of the following is a correct example of an alkene? {
    ~CH₄
    =C₂H₄
    ~C₂H₂
    ~C₃H₈
}

//True or False

Alkanes are saturated hydrocarbons. {T}

The general molecular formula of alkenes is CnH2n+2. {F}

Alkynes contain at least one triple bond. {T}

Ethene (C₂H₄) is an example of an alkyne. {F}

Alkanes have only single covalent bonds between carbon atoms. {T}

Ethyne (C₂H₂) contains one double bond. {F}

The molecular formula of propane is C₃H₈. {T}

The bond angle in alkenes is approximately 109.5°. {F}

The molecular formula of an alkane with 4 carbon atoms is C₄H₁₀. {T}

Alkynes are more reactive than alkanes due to the presence of a triple bond. {T}

//Fill in the blanks

The general molecular formula of alkanes is ______. {
    =CnH2n+2
    ~CnH2n
    ~CnH2n-2
    ~CnH2n+1
}

The general molecular formula of alkenes is ______. {
    ~CnH2n+2
    =CnH2n
    ~CnH2n-2
    ~CnH2n+1
}

The general molecular formula of alkynes is ______. {
    ~CnH2n+2
    ~CnH2n
    =CnH2n-2
    ~CnH2n+1
}

Alkanes are ______ hydrocarbons. {
    =Saturated
    ~Unsaturated
    ~Aromatic
    ~Cyclic
}

Alkenes are hydrocarbons that contain at least one ______ bond. {
    ~Single
    =Double
    ~Triple
    ~Ionic
}

Alkynes are hydrocarbons that contain at least one ______ bond. {
    ~Single
    ~Double
    =Triple
    ~Quadruple
}

Methane (CH₄) is an example of an ______. {
    =Alkane
    ~Alkene
    ~Alkyne
    ~Aromatic compound
}

Ethene (C₂H₄) belongs to the ______ series of hydrocarbons. {
    ~Alkane
    =Alkene
    ~Alkyne
    ~Aromatic
}

Ethyne (C₂H₂) is an example of an ______. {
    ~Alkane
    ~Alkene
    =Alkyne
    ~Aromatic compound
}

The bond angle in an alkane molecule is approximately ______. {
    ~90°
    =109.5°
    ~120°
    ~180°
}

//Numericals

What is the molecular formula of an alkane with 5 carbon atoms? {
    ~C5H10
    =C5H12
    ~C5H8
    ~C5H14
}

What is the molecular formula of an alkene with 4 carbon atoms? {
    =C4H8
    ~C4H10
    ~C4H6
    ~C4H12
}

What is the molecular formula of an alkyne with 3 carbon atoms? {
    ~C3H6
    =C3H4
    ~C3H8
    ~C3H10
}

How many hydrogen atoms are present in an alkane with 7 carbon atoms? {
    ~14
    ~16
    =18
    ~20
}

What is the molecular formula of ethyne? {
    ~C2H4
    ~C2H6
    =C2H2
    ~C2H8
}

What is the degree of unsaturation in an alkene with the formula C4H8? {
    =1
    ~2
    ~3
    ~4
}

What is the molecular formula of propane? {
    =C3H8
    ~C3H6
    ~C3H4
    ~C3H10
}

How many π-bonds are present in the molecule of ethene (C2H4)? {
    ~0
    =1
    ~2
    ~3
}

How many σ-bonds are present in a molecule of ethyne (C2H2)? {
    ~1
    =2
    ~3
    ~4
}

What is the molecular formula of an alkane with 10 carbon atoms? {
    ~C10H20
    =C10H22
    ~C10H18
    ~C10H24
}

//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Alkanes -> CnH2n+2
=Alkenes -> CnH2n
=Alkynes -> CnH2n-2
=Ethene -> Double bond
}


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