Aldehydes Ketones and Carboxylic Acids Test

Result

Aldehydes Ketones and Carboxylic Acids Test - 30

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Which of the following chemical is used in making metal polishes:

A
oxalic acid

B
methanoic acid

C
both A and B

D
none of these

Solution

Uses of oxalic acid are:
Bleaching agent in textile activities,
Marble polishing
Purifying agent in pharmaceutical industries
Question 2
1 / -0

Which acid is used as table vinegar?

A
Formic acid

B
Acetic acid

C
Picric acid

D
None of these

Solution

Acetic acid is also called as vinegar.
Question 3
1 / -0

Which of the following is not a use of benzoic acid?

A
Food preservative

B
Anticeptic

C
In manufacture of dye

D
In metal polish

Solution

Benzoic acid is used as food preservatives, antiseptic and for dyes. But not for metal polish.
Oxalic acid is used in making metal polish.
Question 4
1 / -0

Acid present in honey bee sting is:

A
formic acid

B
propanoic acid

C
butanoic acid

D
none of these

Solution

Formic acid is present in honey bee sting which is used for Chemo communication.
Question 5
1 / -0

The general formula $${ C }_{ n }{ H }_{ 2n }{ O }_{ 2 }$$ could be for open chain

A
Diketones

B
Carboxylic acid

C
Diols

D
Diadehydes

Solution

$${ C }_{ n }{ H }_{ 2n }{ O }_{ 2 }$$ is the general formula for open chain carboxylic acid and ester e.g if $$n=3\Rightarrow { C }_{ 3 }{ H }_{ 6 }{ O }_{ 2 }$$
Ester-$${ CH }_{ 3 }COO{ CH }_{ 3 }$$
Acid-$${ CH }_{ 3 }{ CH }_{ 2 }COOH$$
Question 6
1 / -0

Which of the following statements is incorrect regarding the reaction?

$$CH_3CHO+[Ag(NH_3)_2]^{\oplus} + \bar{OH} \rightarrow CH+3COO^-+Ag$$

A
The equivalent weight of $$CH_3CHO$$ is 22

B
Three moles of $$OH^-$$ are required in the above reaction

C
$$CH_3CHO$$ is an oxidising agent

D
Reduction of $$[Ag(NH_3)_2]^{\oplus}occurs$$

Solution

Oxidation:

$$CH_3CHO+3\bar{OH} \rightarrow CH_3COO^-+2e+2H_2O$$ ...(i)

Reduction :

$$\{Ag(NH_3)_2]^++e^{\oplus}\rightarrow Ag+2NH_3\}\times 2$$ ...(ii)

$$\therefore CH_3CHO+[Ag(NH_3)_2]^{\oplus}+3\bar{OH}\rightarrow CH_3COO^-+2H_2O+2Ag+4NH_3$$

Molecular mass of $$CH_3CHO=44$$

Equivalent weight $$=\dfrac{MW}{n-factor}=\dfrac{44}{2}=22$$

Therefore, acetaldehyde reducing agent

Hence, the correct option is $$\text{C}$$
Question 7
1 / -0

$$C_nH_{2n-1}COOH$$ is the general formula for:

A
saturated fatty acids

B
unsaturated fatty acids

C
simple lipids

D
phospholipids

Solution

$$C_nH_{2n-1}COOH$$ is a general formula for unsaturated fatty acids.
For example: $$CH_2=CH-COOH$$
Propenoic acid $$C_2H_3COOH$$
$$C_nH_{2n+1}COOH$$ is general formula for saturated fatty acids.
For example: $$CH_3COOH$$ is Ethanoic acid.
Question 8
1 / -0

Reduction of ketones cannot be carried out with which of the following reagents?

A
Zinc amalgam and concentrated HCl

B
Hydrazine and KOH in ethylene glycol

C
Sodium borohydride or Lithium Aluminium hydride

D
Hydrogen in presence of palladium in Barrium sulphate and quinoline

Solution

Reduction of ketones cannot be carried out with hydrogen in presence of palladium in Barrium sulphate and quinoline. This reagent is Lindlar's catalyst and is used for selective reduction of alkyne to trans alkene.

In Clemmensen's reduction, zinc amalgam and concentrated HCl converts carbonyl group to methylene group.

in Wolf Kishner's reduction, Hydrazine and KOH in ethylene glycol converts carbonyl group to methylene group.

Sodium borohydride or Lithium Aluminium hydride reduces keto groups to alcohols.
Question 9
1 / -0

One girl student uses the liquid compound to remove nail paint from her nail. The liquid compound removes the nail paint from her nail. Give the name of this compound.

A
Acetic acid

B
Formalin

C
Ethanol

D
Propanone

Solution

Propanone also called acetone is used to remove nail paint from the nail.

Acetone is a volatile, flammable and colorless liquid that is miscible with water. On the other hand, nail polish remover is an organic solvent that may include coloring, scents, oils, and solvents.

Option D is correct.
Question 10
1 / -0

Which of the following is crossed aldol product in the reaction?
$$CH_3CHO+CH_3CH_2CHO\xrightarrow[25^oC]{OH^-}$$ $$'P'$$

A

B

C

D

Solution

Ethanal is more electrophilic than propanal. So, enolate of propanal will attack as nucleophile on ethanal.

The product formed is $$\beta- hydroxy\ aldehyde$$ , given in option C.