Carboxylic Acids

Q. What happens when acetic acid reacts with sodium carbonate?

1. Hydrogen gas is evolved.
2. Methane gas is evolved
3. Oxygen gas is evolved.
4. Carbon dioxide gas is evolved.

Q. Vinegar is a solution of:

1. 50% - 60% acetic acid in alcohol.
2. 5% - 8% acetic acid in alcohol.
3. 5% - 8% acetic acid in water.
4. 50% - 60% acetic acid in water.

Q. How many structure or carboxylic acids and ester are possible for the following molecular formula C6 H12 O2 & C6 H12 O2

Q. Nitric acid is an example of a covalent compound.

1. False
2. True

Q. The chemical formula of vinegar is.

1. $HCOOH$
2. $C{H}_{3}COOH$
3. $C{H}_{3}C{H}_{2}COOH$

Q. Question 33
A compound $\text{X}$ is formed by the reaction of a carboxylic acid ${\text{C}}_2{\text{H}}_4{\text{O}}_2$ and an alcohol in presence of a few drops of ${\text{H}}_2{\text{SO}}_4$. The alcohol on oxidation with alkaline ${\text{KMnO}}_4$ followed by acidification gives the same carboxylic acid as used in this reaction. Give the names and structures of (a) carboxylic acid, (b) alcohol and (c) the compound $\text{X}$. Also write the reaction.

Q.

Vinegar contains

1. $100\%$ acetic acid

2. $10\%$ acetic acid dissolved in water

3. $6\%-10\%$ acetic acid dissolved in water

4. $15\%-20\%$ acetic acid dissolved in water

Q. 2ml of ethanoic acid was taken in each of the three test tubes A, B and C and 2ml, 4ml and 8ml water was added to them, respectively. A clear solution is obtained in:

1. Test tube A only
2. Test tubes A & B only.
3. Test tubes B and C only
4. All the test tubes

Q.

A student dipped a pH paper in an unknown liquid. Orange colour was obtained. The unknown solution can be:

1. Acetic acid

2. Ethanoic acid

3. Sodium carbonate

4. Both acetic acid and ethanoic acid

Q.

Vinegar is a

1. Dilute acetic acid

2. Sorbic acid

3. Benzoic acid

4. Potassium nitrate

Q.

The compound(s) belonging to the carboxylic acid family is/are

1. 

2. 

3. 

4. 

Q.

A compound X is obtained by the reaction of alkaline $KMn{O}_3$ with another compound Y followed by acidification. Compound X also reacts with compound Y in presence of few drops of $H_{2}S{O}_4$ to form a sweet smelling compound Z. The compound X, Y and Z are respectively.

1. Ethanol, Ethanoic Acid, Sodium Ethanoate

2. Ethanol, Ethene, Ethanoic acid

3. Ethanoic acid, Ethanol, Ethylethanoate

4. Ethanoic Acid, Ethanal, Ethene

Q. A dehydration reaction is a reaction in which there is _______ .

1. an addition of water
2. a loss of water
3. an addition of hydrogen
4. a loss of hydrogen

Q.

Why are some perishable foods preserved in vinegar?

Q. Name the products formed and write an equation when ethyne is added to the following in an inert solvent:
a) Chlorine
b) Bromine
c) Iodine
d) Hydrogen
e) Excess of hydrochloric acid

[5 MARKS]

Q.

Write two tests to demonstrate Ethanoic acid is acidic in nature?

Q. Acetic acid is one carboxylic acid which is used in our daily life.
(a) 100% acetic acid is known as ............ .
(b) What is vinegar?
(c) Write one use of vinegar in our daily life.

Q. The reaction of sodium hydrogen carbonate with ethanoic acid is used as a test for detection of carboxylic acid, Why?

1. because acetic acid is soluble in water.
2. because carbon dioxide gas is produced in this reaction which can be easily identified.
3. because acetic acid can react with sodium hydrogen carbonate.
4. because water is produced in this reaction which can be easily identified.

Q. Carboxylic acids have a group in its molecule.

1. -OH
2. R-O-R
3. -COOH
4. -CHO

Q.

Which acid is used to make vinegar?

Q. The main constituent of Vinegar is:

1. ascorbic acid
2. citric acid
3. acetic acid
4. tartaric acid

Q. True or False.
Ethanoic acid can be manufactured by treating methanol with carbon monoxide in the presence of a catalyst.

1. True
2. False

Q.

HCl is a strong acid because it ________ in water.

1. Associates partially

2. Associates completely

3. Dissociates completely

4. Dissociates partially

Q.

An organic compound which is used in the silk industry and has molecular formula $C_2{H}_4{O}_2$ and gives an ester compound on reaction with ethanol. The compound is

1. Ethanal

2. Acetone

3. Ethanoic acid

4. Methanoic acid

Q. Identify the compound that exhibits tautomerism:

1. Phenol
2. 2-Butene
3. Lactic acid
4. 2-Pentanone

Q.

The group which is responsible for acidic behavior in acetic acid is:

1. -OH

2. -COOH

3. -CHO

4. -O-

Q. (a) Ethanoic acid reacts with ethanol in the presence of concentrated $H_2{SO}_4$.
(i) Name the organic product formed.
(ii) Give the name of the reaction.
(iii) What is the role of $H_2{SO}_4$ in the above reaction?
(b) The molecular formula of an organic compound is ${CH}_{3}COOH$.
(i) Write the IUPAC name of this compound.
(ii) Give one use of this compound.

Q. What is vinegar, and how is it prepared? [2 Marks]

Q. Which of the following is not a carboxylic acid?

1. B
2. D
3. A
4. C

Q.

Two gases are released when conc. sulphuric acid reacts with :

1. Ethanol

2. Oxalic acid

3. Formic acid

4. Cane sugar