laboursonline – MCQs, Mock Tests | Chemistry Chemistry MCQ Question

Which of the following substance produce acetaldehyde on dry distillation?

1. (CH3COO)2Ca
2. (HCOO)2Ca
3. both (a) and (b)
4. none

✅ Correct Answer: 3

Which of the following will have the highest boiling point?

1. methanal
2. ethanal
3. propanal
4. hexanone

✅ Correct Answer: 4

Which of the following reaction is not shown by ketones?

1. reaction with HCN
2. reaction with NaHSO3
3. reaction with 2 4 dinitrophenyl hydrazine
4. reaction with Fehling solution

✅ Correct Answer: 4

The carbon atom of carbonyl group is

1. sp hybridized
2. sp2 hybridized
3. cp3 hybridized
4. dsp2 hybridized

✅ Correct Answer: 2

Which of the following substances does not give iodoform test?

1. acetaldehyde
2. ethyl alcohol
3. methyl alcohol
4. acetone

✅ Correct Answer: 3

Formalin is _______ % solution of formaldehyde in water

1. 10%
2. 20%
3. 40%
4. 60%

✅ Correct Answer: 3

Which of the following aldehydes shows rapid reaction with sodium nitroprusside?

1. formaldehyde
2. accetaldehyde
3. benzaldehyde
4. acetone

✅ Correct Answer: 4

Acetone reacts with HCN to form a cyanohydrin. It is an example of

1. electronphilic addition
2. electrophilic substitution
3. nucleophilic addition
4. nucleophilic substitution

✅ Correct Answer: 3

Which of the following compounds will react with Tollens reagent?

1. CH3-CHO
2. CH3-CH-CH3
3. CH3-COOH
4. CH3-CO-CH2-CH3

✅ Correct Answer: 1

Which of the following reactions may be assoclated with aldehyde and ketone?

1. nucleophile addition
2. polymerization
3. oxidation
4. all of the above

✅ Correct Answer: 4

Cannizzaros reaction is not given by

1. formaldehyde
2. acetaldehyde
3. benzaldehyde
4. trimethyl acetaldehyde

✅ Correct Answer: 2

Which of the following reagents will react with both aldehydes and ketones?

1. Grignard reagent
2. Tollens reagent
3. Fehlings reagent
4. Benedicts reagent

✅ Correct Answer: 1

Ketones are comparatively less reactive than aldehdye. It is due to

1. alkyl groups are electron donating
2. steric hindrance
3. both (a) and (b)
4. none

✅ Correct Answer: 3

Which of the following do not give aldol condensation reactions?

1. formaldehyde
2. acetaldehyde
3. diemthyl ketone
4. propionaldehyde

✅ Correct Answer: 1

Which of the following is not a use of formaldehyde?

1. in silvery mirror
2. in making medicine urotropine
3. in making throat lozenges
4. in making acetic acid

✅ Correct Answer: 4

Formaldehyde and lactose are combined to produce throat lozenges named as

1. formamint
2. lactomint
3. aldomint
4. formalactose

✅ Correct Answer: 1

Which of the following is not a use of acetaldehyde?

1. formation of phenolic resins
2. formation of mirror
3. antiseptic inhalant
4. formation of throat lozenges

✅ Correct Answer: 4

Formula of haloform is

1. HCOX
2. CX4
3. CHX3
4. CH3X

✅ Correct Answer: 3

Formaldehyde condenses with phenol in the presence of dilute H2SO4 to yield

1. Nylon 66
2. urotropine
3. Aniline formaldehyde plastic
4. Bakelite

✅ Correct Answer: 4

Formalin consists of mixture of formaldehyde methyl alcohol and water. Percentage of water in it is

1. 60%
2. 50%
3. 52%
4. 8%

✅ Correct Answer: 3

Which of the following will not give addition reaction with NaHSO3

1. HCHO
2. CH3CHO
3. CH3-CH2-CHO
4. None of the above

✅ Correct Answer: 3

On heating aldehydes with Fehlings solution we get a precipitate whose colour is

1. pink
2. black
3. yellow
4. brick red

✅ Correct Answer: 4

Which of the following compounds has the empirical formula CH2O and reacts with sodium hydroxide?

1. carbonic acid
2. ethanol
3. acetic acid
4. methanoic acid

✅ Correct Answer: 3

Aldehyde and ketone have same general formula for homologous series

1. CnH2nO2n
2. CnH2n
3. CnH2nO
4. CnH2nOn+1

✅ Correct Answer: 3

Oxidation of primary alcohol gives

1. ketone
2. Aldehyde
3. Alkene then - COOH
4. Ester

✅ Correct Answer: 2

Ethanal is prepared industrially by air oxidation of ethylene using palladium chloride as catalyst and _____ as promoter

1. PdCl2
2. Cu2Cl2
3. CuCl2
4. PbCl2

✅ Correct Answer: 3

Ncleophilic addition reactions are catalysed

1. Acid
2. Base
3. Both a and b
4. None

✅ Correct Answer: 3

Acetaldehyele cyanohydrin on acid hydrolysis yields

1. Tartaric acid
2. Propanoic acid
3. Lactic acid
4. Valeric acid

✅ Correct Answer: 3

Acetal on acid hydrolysis generates

1. Alcohol
2. Ketone
3. Both a & b
4. None of the above

✅ Correct Answer: 3

Which one exhibits aldol condensation

1. HCHO
2. C6H5CHO
3. Cl3CCHO
4. CH3COCH3

✅ Correct Answer: 4

For aldol condensation the conditions necessary

1. ?-C
2. ?-H
3. Basic medium
4. All

✅ Correct Answer: 4

Aldehydes are reduced to

1. P? alcohol
2. S? alcohol
3. T? alcohol
4. Not possible

✅ Correct Answer: 1

Tetrahydroborate ion is the source of

1. proton
2. H+
3. both a & b
4. H-

✅ Correct Answer: 4

Which of the following is a symmetrical ketone

1. 3 - hexanone
2. acetone
3. butanone
4. 2-pentanone

✅ Correct Answer: 2

Dry distillation of calcium acetate results in the formation of

1. formaldehyde
2. acetaldehyde
3. methane
4. acetone

✅ Correct Answer: 4

In base catalyzed reaction of carbonyl compound the catalyst

1. increases the nucleophilic character of reagent
2. increases electrophilic character of carbonyl compound
3. acidic character of reagent
4. both a and b

✅ Correct Answer: 1

Cannizaros reaction takes place through the transfer of _______ from complex anion.

1. hydrogen ion
2. hydride ion
3. oxide ion
4. methoxide ion

✅ Correct Answer: 2

Iodoform test can be used to distinguish between

1. ethanol and methanol
2. acetaldehyde and methanal
3. acetone and diethyl ketone
4. all of the above

✅ Correct Answer: 4

The fertility of the soil is improved by

1. Rotation of the crops
2. Adding lime to the acid salts
3. Adding manure and growing legumes
4. All

✅ Correct Answer: 4

Which of the following is incorrect statement about nitrogen importance?

1. It enhances plant growth
2. It is involved in the synthesis of protein and nucleic acids
3. it accelerates fruits and flowers growth
4. It is involved in the chlorophyll synthesis

✅ Correct Answer: 3

The fertilizers which provide single nutrient from NPK are called ______ fertilizer.

1. straight
2. compound
3. both a and b
4. none of the above

✅ Correct Answer: 1

Which of the following is macronutrient?

1. Cu
2. Cl
3. H
4. Zn

✅ Correct Answer: 3

Addition of urea to the soil is _________ reaction.

1. endothermic
2. exothermic
3. both a and b
4. no heat energy is involved

✅ Correct Answer: 2

Which of the following is the most suitable catalyst for ammonia synthesis?

1. Pt
2. ZnO + Cr2O3
3. Fe in fused mixture of Al2O3 + SiQ2 + MgO
4. All of the above

✅ Correct Answer: 3

The cooling of molten urea by air in the tower is called

1. prilling
2. evaporation
3. condensation
4. crystallization

✅ Correct Answer: 1

Which of the following fertilizers is not useful for paddy rice?

1. urea
2. DAP
3. Ammonium sulphate
4. Ammonium nitrate

✅ Correct Answer: 4

DAP (Diammonium hydrogen phosphate) contains _________ plant nutrients.

1. 60%
2. 65%
3. 70%
4. 75%

✅ Correct Answer: 4

Which of the following potassium fertilizers are more useful for horticultural crops tobacco & potatoes?

1. KCI
2. KNO3
3. K2SO4
4. KMnO4

✅ Correct Answer: 2

Calcarious material includes

1. lime stone
2. marble
3. chalk
4. all of the above

✅ Correct Answer: 4

Argillaceous material does not include

1. vlay
2. marine shells
3. slate
4. blast furnace slag

✅ Correct Answer: 2

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Chemistry MCQ Question - Aldehydes and Ketones