Tag: chemistry

Questions Related to chemistry

Which among the following is corect IUPAC name ?

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

  1. 1, 1 - Dimethyl cyclohexan - 3 - ol

  2. 4 - Methyl bicyclo [3 . 2 . 0] heptane

  3. Butane - 1, 2 - dione

  4. 4 - Ethyl -5 - methyl cyclohexene

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Correct Option: C

What is its IUPAC name?


$CH _3-\underset{\displaystyle CH _3}{\underset{|}{CH}}-CH _2-OH$.

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

  1. 2-methyl propanol

  2. 2-ethyl ethanol

  3. 3-methyl propanol

  4. 3-ethyl ethanol

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Correct Option: A
Explanation:

$\overset{3}{C}H _3-\overset{2}{\underset{CH _3}{\underset{|}{CH}}}-\overset{1\,\,\,\,\,}{CH _2}-OH$

2-Methyl propanol.

What is the functional group in alcohol?

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

  1. $-OH$

  2. $-CN$

  3. $-NC$

  4. -$NH _2$

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Correct Option: A
Explanation:

$-OH$ (Hydroxyl group) is the functional group of alcohol. Because, if we add $-OH$ to a Methyl group $(-CH _3)$, it will be converted to Methyl alcohol $(CH _3OH)$

The IUPAC name of : $CH _3 - \overset{CH _3\!\!\!\!\!}{\overset{|}{C}} - \overset{O}{\overset{||}{C}} - CH _2 - CH _2 OH$
chemistry derivatives of hydrocarbons alcohol nomenclature of alcohols and phenols introduction to alcohols

  1. 1-hydroxy-4- methylpentan-3-one

  2. 2-methyl-5-hydroxypentane-3-one

  3. 4-methyl-3-oxopentan-1-ol

  4. Hexan-1-ol-3-one

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Correct Option: C

State, whether the following statements are True or False:
Picric acid is $2,4,6-trinitrotoluene$.

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

  1. True

  2. False

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Correct Option: B
Explanation:

$2,4,6-trinitrophenol$ is picric acid while, $2,4,6-trinitrotoluene$ is $TNT$.

What is IUPAC name of the following compound? 
C$H _3$ - C$H _2$ - C$H _2$ - OH

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

  1. Propane-1-ol

  2. Propane-2-ol

  3. Ethane-1-ol

  4. Ethane-2-ol

Show answer
Correct Option: A
Explanation:

${ CH } _{ 3 }^{ 3 }{ CH } _{ 2 }^{ 2 }{ CH } _{ 2 }^{ 1 }{ OH }$
Carbon with functional group gets position 1. Therefore, IUPAC name is Propan-1-ol.

The IUPAC name of $(CH _{3}) _{2}CHCH _{2}CH _{2}OH$ is:

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

  1. 3-Methyl butan-1-ol

  2. 2-methyl pentan-1-ol

  3. 3-ethyl pentan-1-ol

  4. 2-ethyl butan-1-ol

Show answer
Correct Option: A
Explanation:
$H-\overset{\overset{4}{CH _3}}{\overset{|}{\underset{CH _3}{\underset{|}{C _3}}}}-\underset{2}{CH}-CH _2-OH$

3-Methyl butan-1-ol

Option A is correct.

$CH _3-\underset{OH}{\underset{|}{C}H}-\underset{OH}{\underset{|}{C}H}-CH _3$

IUPAC name of the given compound is :

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

  1. Butane-2,3-diol

  2. 1-Methyl-propane-1,2-diol

  3. Both (A) and (B)

  4. None of these

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Correct Option: A
Explanation:

Two functional group $OH (ol)$  is attached at carbon no $2$ & $ 3$ so its name is butane$-2,3-$diol.

Which of the following is a primary alcohol ?

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

  1. Butan - 2 - ol

  2. 2 - Methylpropan -1- ol

  3. 2 - Methylpropan - 2- ol

  4. None of the above

Show answer
Correct Option: B
Explanation:

$CH _{3}-CH(CH _{3})-CH _{2}-OH$ is a primary alcohol as hydroxal group; -OH is attached to the primary carbon.

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

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

  1. Trinitrobenzene

  2. $2,4,6-trinitrophenol$

  3. Trinitrotoluene

  4. Trinitroaniline

Show answer
Correct Option: B
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.