Carboxylic Acid & Derivatives Test

Result

Carboxylic Acid & Derivatives Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

Formic acid is not a representative member of carboxylic acids because:

A
it does not contain alkyl group

B
it contains an aldehydic group while the other acids do not

C
it is the first member of the series

D
it is a gas

Solution

Formic acid forms hydrogen bonded dimers and it shares most of the properties of carboxylic acids but it shares reducing properties of aldehydes and reducing properties of some other metals too. It has high acidity so its solution in alcohols form esters spontaneously.
Question 2
1 / -0

Given below are some statements concerning formic acid, which of them is true?

A
It is weaker acid than acetic acid.

B
It is reducing agent.

C
When its calcium salt is heated, it forms a ketone.

D
It is an oxidising agent.

Solution

If a compound gets oxidized (as formic acid can), then another compound has to be reduced. The compound that gets oxidized is called a reducing agent.

It reduces Tollen's reagent to silver mirror.

Formic acid acts as a reducing agent as it can reduce Tollen's reagent, Fehling solution, mercuric chloride and KMnO₄ etc.
Question 3
1 / -0

In the above set of reactions, acetic acid yielded a product D. The structure of D would be:

A

B

C

D

Solution
Question 4
1 / -0

What is formed when oxalic acid is dehydrated by conc. H₂SO₄?

A
C+CO₂

B
CO

C
CO₂

D
CO+CO₂

Solution
Question 5
1 / -0

The formula (RCO)₂O represents :

A
Esters

B
Acid anhydrides

C
Carboxylic acids

D
Carbonyl compound

Solution

Acid Anhydride
Question 6
1 / -0

Glacial acetic acid is obtained by

A
distilling vinegar

B
crystallizing separating and melting acetic acid

C
treating vinegar with dehydrating agent

D
chemically separating acetic acid

Solution

Acetic acid freezes at 16-6^∘C while water freezes at 0^∘C. So glacial acetic acid is obtained by crystallizing, separating and melting acetic acid
Question 7
1 / -0

Cyanohydrin of which of the following forms lactic acid

A
CH₃CH₂CHO

B
CH₃CHO

C
CH₃COCH₃

D
HCHO

Solution

Cyanohydrin addition increases one C-atom in acetaldehyde which on hydrolysis gives lactic acid.
Question 8
1 / -0

When acetamide is hydrolysed by boiling with acid, the product obtained is :

A
acetic acid

B
ethyl amine

C
ethanol

D
acetamide

Solution

In presence of dil HCl, acetamide is hydrolysed by boiling, the product obtained is acetic acid
Question 9
1 / -0

How will you convert butan-2-one to propanoic acid

A
Tollens reagent

B
Fehlings solution

C
NaOH/I₂/H+

D
NaOH/NaI/H⁺

Solution
Question 10
1 / -0

On mixing ethyl acetate with aqueous sodium chloride the composition of the resultant solution is:

A
CH₃COOC₂H₅+NaCl

B
CH₃Cl+C₂H₅COONa

C
CH₃COCl+C₂H₅OH+NaOH

D
CH₃COONa+C₂H₅OH

Solution

aqueous NaCl is a neutral compound. Thus no reaction takes place between ethyl acetate and aqueous NaCl.

Thus resultant solution will be CH₃COOC₂H₅+NaCl