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

//Multiple Choice

The molecular formula of methane is\: {
    =CH₄
    ~C₂H₆
    ~C₃H₈
    ~CH₃OH
}

The structural formula represents\: {
    ~The total number of atoms in a molecule
    ~The three-dimensional arrangement of atoms
    =The connectivity of atoms in a molecule
    ~The number of valence electrons
}

The condensed structural formula of ethane is\: {
    ~CH₄
    =CH₃CH₃
    ~CH₃CH₂OH
    ~C₂H₂
}

The general formula for alkanes is\: {
    ~CₙH₂ₙ
    =CₙH₂ₙ₊₂
    ~CₙH₂ₙ₋₂
    ~CₙH₂ₙ₊₁OH
}

The structural formula of ethene contains\: {
    ~A single bond between carbon atoms
    =A double bond between carbon atoms
    ~A triple bond between carbon atoms
    ~No bonds between carbon atoms
}

The molecular formula of ethanol is\: {
    ~CH₄
    =C₂H₆O
    ~C₂H₄O₂
    ~C₂H₆
}

Which type of formula shows all atoms and bonds in a molecule? {
    ~Molecular formula
    =Structural formula
    ~Condensed formula
    ~Empirical formula
}

The functional group present in alcohols is\: {
    ~–COOH
    =–OH
    ~–CHO
    ~–NH₂
}

The structural formula of propene is\: {
    ~CH₃CH₂CH₃
    =CH₃CH=CH₂
    ~CH≡CH
    ~CH₃OH
}

The IUPAC name of CH₃CH₂OH is\: {
    ~Ethene
    =Ethanol
    ~Ethanoic acid
    ~Methanol
}

//True or False

Ethanol has the molecular formula C₂H₆O. {T}

Alkanes contain at least one double bond. {F}

The functional group of aldehydes is –CHO. {T}

The condensed formula of ethane is CH₃CH₃. {T}

Alkenes follow the general formula CₙH₂ₙ₊₂. {F}

Methanol is an example of an alcohol. {T}

The molecular formula of ethanoic acid is C₂H₄O₂. {T}

A structural formula shows only the number of atoms in a molecule. {F}

Propene contains a triple bond between carbon atoms. {F}

The simplest alkyne is ethyne. {T}

//Fill in the blanks

The molecular formula of propane is\: {
    =C₃H₈
    ~C₂H₆
    ~CH₄
    ~None of the above
}

The condensed structural formula of butane is\: {
    ~CH₃CH₃
    =CH₃CH₂CH₂CH₃
    ~C₄H₈
    ~None of the above
}

The general formula for alkenes is\: {
    =CₙH₂ₙ
    ~CₙH₂ₙ₊₂
    ~CₙH₂ₙ₋₂
    ~None of the above
}

The functional group of carboxylic acids is\: {
    =–COOH
    ~–OH
    ~–CHO
    ~None of the above
}

The molecular formula of ethene is\: {
    ~C₂H₆
    =C₂H₄
    ~CH₄
    ~None of the above
}

The IUPAC name of CH₃COOH is\: {
    ~Methanol
    ~Ethanol
    =Ethanoic acid
    ~None of the above
}

The structure of ethyne contains a _____ bond between carbon atoms. {
    ~Single
    ~Double
    =Triple
    ~None of the above
}

The simplest alkene is\: {
    =Ethene
    ~Methane
    ~Propane
    ~None of the above
}

The molecular formula of methanol is\: {
    =CH₃OH
    ~C₂H₆O
    ~CH₄
    ~None of the above
}

The general formula for alkynes is\: {
    =CₙH₂ₙ₋₂
    ~CₙH₂ₙ
    ~CₙH₂ₙ₊₂
    ~None of the above
}

//Numericals

Calculate the molecular mass of methane (CH₄). (Atomic masses\: C \= 12, H \= 1) {
    ~14 g/mol
    =16 g/mol
    ~18 g/mol
    ~12 g/mol
}

A hydrocarbon contains 6 carbon atoms and follows the general formula of an alkane. What is its molecular formula? {
    ~C₆H₁₂
    =C₆H₁₄
    ~C₆H₆
    ~C₆H₁₀
}

Calculate the number of hydrogen atoms in a molecule of butane (C₄H₁₀). {
    ~8
    =10
    ~12
    ~14
}

Calculate the molecular mass of ethane (C₂H₆). (Atomic masses\: C \= 12, H \= 1) {
    ~28 g/mol
    =30 g/mol
    ~32 g/mol
    ~26 g/mol
}

A hydrocarbon contains 4 carbon atoms and follows the general formula of an alkane. What is its molecular formula? {
    ~C₄H₈
    =C₄H₁₀
    ~C₄H₆
    ~C₄H₄
}

//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Methane CH4 -> Simplest Alkane
=Ethene C2H4 -> Contains a double bond
=Ethyne C2H2 -> Contains a triple bond
=Ethanol C2H6O -> Alcohol functional group
}


//******** END **********