Tag: derivatives of hydrocarbons

Quizzes (13) Questions (20)

Questions Related to derivatives of hydrocarbons

Multiple choice chemistry derivatives of hydrocarbons alcohol nomenclature of alcohols and phenols introduction to alcohols

Picric acid is a yellow coloured compound. Its chemical name is:

  1. Trinitrobenzene
  2. $2,4,6-trinitrophenol$

  3. Trinitrotoluene

  4. Trinitroaniline
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Picric acid is 2,4,6-trinitrophenol. It is yellow crystalline solid. It is an explosive. Wet picric acid is used as a skin dye reacting with proteins in skin to give dark brown color.

Multiple choice chemistry derivatives of hydrocarbons alcohol nomenclature of alcohols and phenols introduction to alcohols

The molecular formula of ethanol is :

  1. $(CH _3) _2 CHOH$
  2. $C _2 H _5 OH$
  3. $CH _3 OH$
  4. $CH _3 CH _2 CH _2 OH$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$(CH _3) _2CHOH$ is 2-propanol or isopropyl alcohol, $CH _3OH$ is methanol, $CH _3CH _2CH _2OH$ is 1- propanol or isopropyl alcohol.

The compound in option B is ethanol. It is hydroxyl derivative of ethane.

Multiple choice chemistry derivatives of hydrocarbons alcohol nomenclature of alcohols and phenols introduction to alcohols

Write the IUPAC name of the given compound:

$\begin{matrix} HO-C{ H } _{ 2 } \ - & CH &-C{ H } _{ 2 }-OH \  & | &  \  & C{ H } _{ 3 } &  \end{matrix}$

  1. 2-Methylpropane-1,3-diol

  2. 2-Methylpropan-1,3-dial

  3. 1-Hydroxy-2-methylpropan-1-ol

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The given compound can be numbered from left to right or vice versa. At the 2nd position, there is a methyl group and is designated as 2-Methyl. 


The parent carbon chain contains 3 carbon atoms resembling propane and at the positions 1 and 3, there's the hydroxyl group designated as 1,3-diol. 


So the IUPAC name of the given compound is 2-Methylpropane-1,3-diol.


The answer is option A.

Multiple choice chemistry derivatives of hydrocarbons alcohol nomenclature of alcohols and phenols introduction to alcohols

What is the $IUPAC$ name of the following compound?


$CH _{3} - CH _{2} - CH _{2} - OH$

  1. Propan-1-ol

  2. Propan-2-ol

  3. Propane-1-ol

  4. Ethane-2-ol
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In this compound, the number of carbon atoms is 3. So, the parent alkane is propane. 


The functional group present is $-OH$ i.e alcohol. $-OH$ is present at the first carbon atom 

Thus the IUPAC name is Propan - 1 - ol.

Multiple choice chemistry derivatives of hydrocarbons alcohol nomenclature of alcohols and phenols introduction to alcohols

Identify 'C' in the following reaction. 


$C _2H _5Br       \overset{KCN}  {\longrightarrow} A \overset{H^+ H _2O}   {\longrightarrow} B \overset{LiAlH _4}{\longrightarrow} C$

  1. $Propan - 1 - ol$
  2. $Propanone$
  3. $2 - Ethyl - 3 - pentanone$
  4. $Propanal$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

C2H5Br + KCN -> C2H5CN (Propanenitrile). Hydrolysis -> C2H5COOH (Propanoic acid). Reduction with LiAlH4 -> C2H5CH2OH (Propan-1-ol).

Multiple choice chemistry derivatives of hydrocarbons alcohol nomenclature of alcohols and phenols introduction to alcohols

The IUPAC name for $CH _3CH(OH)CH _2C(CH _3) _2OH$ is:

  1. 1, 1-dimethyl-1,3-butanediol

  2. 2-methyl-2,4 pentanediol

  3. 4-methyl-2 4-pentanediol

  4. 1,3,3- trimethyl 1-1,3-propanediol
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The compound has 2 alcohol groups at C-2 positions on both the sides. From this point we can not say from where to start numbering. But if we number from right hand side there is also a methyl group at C-2 position. So we start number from right hand side.
Since there are two alcoholic group, we use suffix "diol"
Thus IUPAC name is: 2-Methyl-2,4 pentanediol

Multiple choice chemistry derivatives of hydrocarbons alcohol nomenclature of alcohols and phenols introduction to alcohols

IUPAC name of the compound $CH _3-CH(CH _2CH _3)-CH _2-CH(OH)-CH _3$ is:

  1. 4-Ethyl-2-pentanol

  2. 4-Methyl-2-hexanol

  3. 2-Ethyl-2-pentanol

  4. 3-Ethyl-2-hexanol
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Longest carbon chain has 6 atoms. We number from right hand side as alcohol group at C-2 gets least number in this case and suffix used for alcohol is "-ol". Methyl group is present at C-4 position.

Thus, IUPAC name is 4-Methyl-2-hexanol.

Multiple choice chemistry derivatives of hydrocarbons alcohol nomenclature of alcohols and phenols introduction to alcohols

The general formula for alcohol series is $C _nH _{2n+1}OH$. Which is the formula for alcohol contains four carbon?  

  1. $C _5H _{11}OH$
  2. $C _4H _{9}OH$
  3. $C _4H _{8}OH$
  4. $C _3H _{8}OH$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The general formula for alcohol series is $C _nH _{2n+1}OH$. The formula for alcohol contains four carbon atoms is
$C _nH _{2n+1}OH$ $=C _4H _{2(4)+1}OH$ $=C _4H _{8+1}OH$ $=C _4H _{9}OH$.