What is the general formula of an aldehyde?

1. R-COOH

2. R-CHO

3. R-COOR

4. R-CH2OH

Which functional group is largely responsible for the chemical and physical properties of aldehydes and ketones?

1. Hydroxyl group

2. Carbonyl group

3. Amine group

4. Ether group

What color precipitate forms when 2,4- dinitrophenylhydrazine reacts with aldehydes and ketones?

1. Blue

2. Yellow

3. Red-orange

4. Green

What is formed when aldehydes and methyl ketones react with sodium bisulfite?

1. Water

2. Gas

3. Crystalline bisulfite addition product

4. Salt

Which test is used to differentiate between aldehydes and ketones based on the formation of a silver mirror?

1. Schiff's test

2. Tollen's test

3. Fehling's test

4. Sodium nitroprusside test

Which color change indicates a positive result in Fehling's test?

1. Blue to red

2. Dark blue to olive green

3. Yellow to green

4. Dark blue to brick-red

Which type of aldehydes can be detected using Fehling's test?

1. Aliphatic

2. Aromatic

3. Both aliphatic and aromatic

4. None of the above

Which test is used to detect methyl ketones and is also used in clinical tests to detect acetone in urine?

1. Tollen's test

2. Fehling's test

3. Sodium nitroprusside test

4. Iodoform test

What color indicates a positive result in the sodium nitroprusside test for methyl ketones?

1. Bright red

2. Yellow

3. Green

4. Purple

What is the positive result of the iodoform test for methyl ketones?

1. Blue precipitate

2. Green solution

3. Yellow crystalline precipitate

4. Red solution

Which group of compounds will give a positive result in the test for the acetyl group?

1. Aldehydes

2. Ketones

3. Alcohols

4. Carboxylic acids

What is the basis of the Molisch test?

1. Formation of silver mirror

2. Dehydration of saccharide by strong acid

3. Formation of red-orange precipitate

4. Formation of violet ring

What compound condenses with a phenolic substance in the Molisch test to form a violet ring?

1. Fehling's reagent

2. 2,4-dinitrophenylhydrazine

3. Furfural

4. Sodium bisulfite

Which functional group is common to both aldehydes, ketones, and monosaccharides?

1. Hydroxyl group

2. Carbonyl group

3. Carboxyl group

4. Ester group

What is the simplest group of carbohydrates?

1. Monosaccharides

2. Disaccharides

3. Polysaccharides

4. Oligosaccharides

Which test is a general test for carbohydrates?

1. Schiff's test

2. Tollen's test

3. Fehling's test

4. Molisch test

What is the product of the dehydration of saccharide by a strong acid in the Molisch test?

1. Fehling's reagent

2. Furfural

3. Acetaldehyde

4. Iodoform

What color precipitate forms at the junction of two liquids in the Molisch test?

1. Blue

2. Green

3. Yellow

4. Violet

Which alcohol can be oxidized to an acetyl group?

1. Methanol

2. Ethanol

3. Isopropyl alcohol

4. Butanol

Which compound is used in the preparation of 2,4-dinitrophenylhydrazone?

1. 2,4-dinitrophenylhydrazine

2. Sodium bisulfite

3. Sodium nitroprusside

4. Ammonical silver nitrate

What test is conducted to detect the carbonyl group using 2,4-dinitrophenylhydrazine?

1. Test A1

2. Test A2

3. Test B1

4. Test C1

In the 2,4-dinitrophenylhydrazine test, what is observed to determine the presence of a precipitate?

1. Color change

2. Time required for precipitation

3. Temperature change

4. pH level change

Which compound is used in the sodium bisulfite test?

1. Acetone

2. Formaldehyde

3. Benzaldehyde

4. Acetaldehyde

What is observed in the sodium bisulfite test to indicate a positive result?

1. Formation of a gas

2. Formation of a precipitate

3. Color change

4. Odor change

Which test is specific for detecting aldehydes?

1. Test A1

2. Test B1

3. Test C1

4. Test D1

What is the purpose of Schiff's test?

1. Detection of ketones

2. Detection of methyl ketones

3. Detection of aldehydes

4. Detection of carboxylic acids

In Tollen's test, what forms on the inner surface of the test tube?

1. Precipitate

2. Shiny substance

3. Gas bubbles

4. Color change

What color precipitate is produced in Fehling's test for aldehydes?

1. Yellow

2. Red

3. Green

4. Blue

Which test is specific for detecting methyl ketones?

1. Test C1

2. Test D1

3. Test E1

4. Test C2

What color change is observed in the sodium nitroprusside test for methyl ketones?

1. Red to blue

2. Yellow to green

3. Blue to pink

4. Colorless to red

In the iodoform test, what indicates a positive result?

1. Formation of gas bubbles

2. Color change to blue

3. Formation of a yellow precipitate

4. Odor change to fruity

What is the purpose of the special test for benzaldehyde?

1. Detection of ketones

2. Detection of aldehydes

3. Detection of carboxylic acids

4. Detection of esters

Which test is a general test for carbohydrates?

1. Test A2

2. Test B2

3. Test D2

4. Test E1

What is observed at the interface of two liquids in the Molisch test?

1. Precipitate formation

2. Color change

3. Ring formation

4. Color in the interface

What is the purpose of inclining the test tube in the Molisch test?

1. To mix the reagents thoroughly

2. To observe the color change

3. To prevent spillage

4. To allow layers to form

What compound is used in the Molisch test?

1. Formaldehyde

2. Acetone

3. Glucose

4. Starch

Which test is conducted to detect the carbonyl group using sodium bisulfite?

1. Test A1

2. Test A2

3. Test B1

4. Test C1

What color is developed in Schiff's test for aldehydes?

1. Yellow

2. Pink

3. Purple

4. Green

What is observed in the Tollen's test for aldehydes?

1. Formation of gas bubbles

2. Formation of a red precipitate

3. Shiny substance on the inner surface

4. Color change to blue

What color precipitate is produced in Fehling's test for aldehydes?

1. Green

2. Red

3. Yellow

4. Blue