Chemistry · Science General

Alcohols, Ethers and Carboxylic Acids

359 Questions

Alcohols, ethers, and carboxylic acids questions explore organic chemistry reactions, chemical formulas, and compound identifications. The topics cover practical applications like antifreeze production and specific chemical conversions. This material helps candidates preparing for science oriented competitive exams.

Organic reactionsChemical compounds identificationAlcohol conversionCarboxylic acid propertiesIndustrial chemical applications

Alcohols, Ethers and Carboxylic Acids Questions

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

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
$C _nH _{2n+1}OH$ $=C _4H _{2(4)+1}OH$ $=C _4H _{8+1}OH$ $=C _4H _{9}OH$.
Multiple choice chemistry manmade materials synthetic rubber rubber polymer

Acetaldehyde can be used for making synthetic:

  1. protein

  2. perfumes

  3. rubbers

  4. sugar
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Acetaldehyde is primarily used as an intermediate in the manufacture of a range of chemicals, perfumes, aniline dyes, plastic and synthetic rubber, etc.

$\therefore$ Answer is option $B$ and $C$.

Multiple choice allotropes of carbon occurrence of carbon compounds in nature polymers chemistry

An infra-red spectrum shows a broad peak at $3000$ $cm^{-1}$ and a strong peak at $1710$ $cm^{-1}$. Which substance could have produced this spectrum?

  1. Methyl propanoate
  2. Propan-$2$-ol

  3. Propanoic acid

  4. Propanone
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Carboxylic acid broad peak is due -OH from 2500  to 3500 $cm^{-1}$ and strong peak due to Carbonyl bond is from 1700 to 1725 $cm^{-1}$
 So the answer is propanoic acid.

Multiple choice botany biotechnology and genetic engineering use of microbes in biotechnology use of microbes in industrial applications useful microorganisms

Which of the following is used to disinfect contaminated utensils?

  1. 5% of phenol

  2. 30% of chloroform

  3. 1% isopropanol

  4. 70% of butanol
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Phenol usually in low concentrations is used in household used for cleaning and disinfecting purpose.Chloroform can't be used for disinfecting utensils as it is an anesthetic drug and causes dizziness.Isopropanol is a flammable reagent and also can't be used as a cleaning product.Butanol is usually used in painting or other work as thinner and also its fumes are harmful if inhaled and may cause slight irritation. so this also can't be used for disinfecting utensils. So, the correct answer is'5% of phenol'

Multiple choice types of polymerisation reactions condensation polymerisation polymer polymers chemistry

Bakelite is formed by:

  1. polymerization of phenol and formaldehyde

  2. polymerization of alcohol and acetaldehyde

  3. condensation of phenol and formaldehyde

  4. condensation of phenol and acetaldehyde
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Bakelite is a thermosetting phenol formaldehyde resin, formed from a condensation reaction of phenol with formaldehyde.


Hence, option C is correct.

Multiple choice chemistry introduction to analytical chemistry interpreting a balanced chemical reaction percentage yield stoichiometric calculations

Methyl benzoate is prepared by the reaction between benzoic acid and methanol, according to the equation 
$ C _{ 6 }H _{ 5 }COOH+CH _{ 3 }OH\longrightarrow C _{ 6 }H _{ 5 }COOCH _{ 3 }+H _{ 2 }O$
Benzoic acid     Methanol           Methyl benzoate
In an experiment 24.4 gm of benzoic acid were reacted with 70.0 mL of $ CH _3OH $. The density of $ CH _3OH $ is $ 0.79 g mL^{-1} $. The methyl benzoate produced had a mass of 21.6g. What was the percentage yield of product ?

  1. 91.7%

  2. 79.4%

  3. 71.5%

  4. 21.7%
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Moles of benzoic acid = 24.4 / 122 = 0.20 mol. Moles of methanol = (70.0 * 0.79) / 32 = 1.728 mol. Benzoic acid is the limiting reactant. Theoretical mass of methyl benzoate = 0.20 mol * 136 g/mol = 27.2 g. Actual mass = 21.6 g. Percentage yield = (21.6 / 27.2) * 100 = 79.4 percent.

Multiple choice chemistry chemical reactions of organic compounds commercially important alcohols - methanol methanol some commercially important alcohols uses of alcohols

Which of the following statements is not correct about methanol?

  1. It is used for drinking purposes.

  2. It is highly poisonous compound.
  3. It can be prepared by reduction of formaldehyde with $LiAlH _4$

  4. It is miscible with water in all proportions.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Methanol can not be used for drinking purposes as it is highly poisonous compound.
It can be prepared by reduction of formaldehyde with $LiAlH _4$ as :
$HCHO+LiAlH _4 \rightarrow CH _3OH$
It can form hydrogen bond with water and that makes it miscible with water in all proportion.