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 nomenclature of ethers alcohols, phenols and ethers chemistry

The functional isomers of ethers are :

  1. ketone

  2. aldehyde

  3. alcohols

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

Functional isomers have the same molecular formula but different functional groups. Ethers (R-O-R) are functional isomers of alcohols (R-OH) because they share the same general formula CnH(2n+2)O.

Multiple choice nomenclature of ethers alcohols, phenols and ethers chemistry

Find out the statement which is not correct in the naming of cyclic ethers.

  1. If a substituent is an alcohol, the alcohol has higher priority

  2. If a substituent is a halide, ether has higher priority

  3. If both an alcohol group and a halide are present, alcohol has higher priority

  4. If a substituent is an alcohol, the ether has higher priority
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In IUPAC naming of cyclic ethers, if a substituent is an alcohol, the alcohol is given the higher priority over the ether.


Hence, the correct option is $D$

Multiple choice

What alcohol strength is in a disinfecting agent?

  1. 99%

  2. 70%

  3. 80%

  4. 60%
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

70% isopropyl alcohol is the standard concentration for disinfection because it contains enough water to penetrate cell walls effectively, whereas higher concentrations evaporate too quickly.

Multiple choice methane study of methane carbon- an important element hydrocarbons chemistry

The equation for the preparation of $CH _4$ from anhydrous sodium ethanoate [sodium acetate] is:
$CH _3COONa + NaOH \xrightarrow {CaO/\Delta } CH _4+ Na _2CO _3$

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Reaction:
$CH _3COONa + NaOH \xrightarrow {CaO/\Delta } CH _4+ Na _2CO _3$
                                                        methane

Multiple choice acyl chlorides carboxylic acids and their derivatives functional derivatives of carboxylic acids carbonyl compounds chemistry

Which of the following statements is wrong?

  1. For the synthesis of esters from carboxylic acids and alcohols, we can often use a base as a catalyst.

  2. For the synthesis of esters from carboxylic acids and alcohols, we can often use an additional acid as a catalyst.

  3. For the alkaline hydrolysis of carboxylic esters, we need to use an excess of base.

  4. For the hydrolysis of carboxylic esters under acidic conditions, we need only a catalytic amount of an additional acid.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Esterification (Fischer esterification) is acid-catalyzed. Using a base would result in a saponification-like reaction or simply fail to catalyze the formation of the ester from the acid and alcohol.

Multiple choice chemistry alcohols, esters and carboxylic acids reduction of carboxylic acids chemical properties chemical properties of carboxylic acids

The reagent(s) used for converting ethanoic acid to ethanol is/are :

  1. $LiAlH _{4}$
  2. $BH _{3}$ in $THF$
  3. $PCl _{3}$
  4. $K _{2}Cr _{2}O _{7}/H^{+}$
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

$BH _3$ in $THF$ being a strong reducing agent, can efficiently convert carboxylic acid into the corresponding primary alcohol. Also, $LiAlH _4$ being a strong reducing agent, releases $H^-$ ions in enough quantity to convert carboxylic acid to the corresponding alcohol. So, ethanoic acid can be converted to ethanol using $BH _3$ in $THF$ and $LiAlH _4$.

Multiple choice chemistry alcohols, esters and carboxylic acids reduction of carboxylic acids chemical properties chemical properties of carboxylic acids

Methyl alcohol when reacted with carbon monoxide using cobalt or rhodium as catalyst , compound $'A'$ is formed. $'A'$ on heating with HI in the presence of red phosphorus as catalyst $'B'$ is formed. $'B'$ is:

  1. $CH _3COOH$
  2. $CH _3CHO$
  3. $CH _3CH _2I$
  4. $CH _3CH _3$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$CH _3OH+CO\xrightarrow [ (High\quad Pressure) ]{ CO/Rh } \underbrace{ CH _3COOH} _{Compound A}$

Alcohol with carbon monoxide in presence of  $CO/Rh$ gives carboxylic Acid.
$CH _3COOH\quad \underrightarrow{Red P+HI}\quad CH _3-CH _3$
$Red P+HI$  is areducing agent and reduces carboxylic acid into hydrocarbons.

Multiple choice chemistry alcohols, esters and carboxylic acids reduction of carboxylic acids chemical properties chemical properties of carboxylic acids

Alcohols can be obtained from carboxylic acids by reduction using one of the following reagents:

  1. $LiAIH _{4}$
  2. $N/alcohol$
  3. $Zn/HCl$
  4. $H _{2}/Ni$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$RCOOH  +  LiAlH _4 \rightarrow RCHO  \rightarrow RCH _2OH $

Carboxylic acids along with lithium aluminium hydride, initially gives aldehyde and then reduced to primary alcohols.

Multiple choice reactions of haloarenes haloalkanes and haloarenes chemistry

Which one of the following would not be a suitable solvent for Grignard reagent?

  1. $CH _{3}CH _{2}OCH _{2}CH _{3}$, diethylether

  2. tetrahydrofuran (THF)
  3. $CH _{3}CH _{2}OH$, ethanol

  4. They would all be suitable solvent.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ethanol has acidic hydrogen, when we use ethanol as solvent it will react with grignard reagent, so it cannot be used as solvent in grignard synthesis. 

Multiple choice reactions of haloarenes haloalkanes and haloarenes chemistry

A student was carrying out a Grignard reaction between $PhMgBr$ and ethyl benzoate. She ran out of anhydrous ether just after the Grignard reagent was made. Which of the following solvents can still used to dissolve the ethyl benzoate for its reaction with already formed $PhMgBr$

  1. acetone

  2. ethyl acetate

  3. absolute alcohol

  4. benzene
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Solution:- (D) benzene

Grignard reagent contains $R$-group which does nucleophilic addition on acetone and accepts Proton from alcohol.
Thus non polar benzene should be taken to carry out above reaction.