CBSE Questions for Class 12 Engineering Chemistry Aldehydes,Ketones And Carboxylic Acids Quiz 13 - MCQExams.com

What is the final product $$'C'$$ in the following reaction ?
$$CH_{3}CHO\xrightarrow {HCN}\,  'A' \xrightarrow {H_{2}O^{+}}\, 'B' \xrightarrow {soda\ lime}\, 'C'$$
  • Propane
  • Propanol
  • Ethanol
  • Propanoic acid
The correct structure representation of carboxylate ion is:
Identify $$(X),\ (Y) $$ and $$(Z)$$ reagents in the given sequence of reaction. $$CH_3COCH_3\xrightarrow[heat]{I_2+NaOH} X \xrightarrow[heat]{Ag} Y \xrightarrow[heat]{H_2SO_4/HgSO_4} Z$$
  • $$ X = CHI_3, \, Y = CH_3CHO, \, Z = HCHO$$
  • $$ X = CHl_3, \, Y = CH_3OH, \, Z = CH_3CHO$$
  • $$ X = CHl_3, \, Y = CH\equiv CH, \, Z = CH_3CHO$$
  • $$X = CH_3COCl_3, \, Y = CH_2=CH_2, \, Z = CH_3CHO$$
$${({C}_{2}{H}_{5}))}_{2}CO\xrightarrow [ { CH }_{ 3 }MgBr\ (excess) ]{ { H }_{ 3 }{ O }^{ + } }  A$$. $$A$$ (alcohol) can also be obtained by:
  • $${CH}_{3}{CH}_{2}CHO\xrightarrow [ { CH }_{ 3 }MgBr\ (2\ mol) ]{ { H }_{ 3 }{ O }^{ + } } $$
  • $$CH_3\overset{O}{\overset{||}{C}}OC_2H_5 \xrightarrow[H_3O^+]{CH_3MgBr(2 \, mol)}$$
  • $$CH_3\overset{O}{\overset{||}{C}}CH_3 \xrightarrow[H_3O^+]{CH_3MgBr(1 \, mol)}$$
  • both $$B$$ and $$C$$
Final product $$(B)$$ will be :

992779_81ef052e67974e338341121f10cf85dd.png
Consider the above sequence and answer the following
Conversion $$R- CHO \rightarrow R-CO_2H$$ can be done by :

991911_2d41c82878bf458d9d968509b18213ff.png
  • $$KMNO_4$$
  • $$H_2CrO_4$$
  • $$K_2Cr_2O_7$$
  • All of these
Number of intramolecular aldol condensation product is:
992197_b39d148061b342c58a6bbd4bb1823e71.JPG
  • 1
  • 2
  • 3
  • 4
Methyl vinyl ketone on reaction with $$LiCuMe_2$$ gives a major product, whose structure is:
Product (P) of the reaction is :
991996_c23d79d4d73b47ecb5502d204fab845b.png
Sodium benzoate has it's application in:
  • food preservation
  • pharmacy
  • fireworks
  • fuel in whistle mix
Reduction reactions of carbonyl compounds is known to be :
  • nucleophilic addition
  • nucleophilic substitution
  • addition reaction
  • elimination reaction
Acetic acid is present in vinegar. Curd contains ______ .
  • lactic acid
  • tartaric acid
  • picric acid
  • None of the above
On acid hydrolysis, propane nitrile gives :
  • Propanal
  • Acetic acid
  • Propionamide
  • Propanoic acid
How does acetaldehyde react with the following reagents ?
  • Dilute aqueous caustic soda
  • Hydrazine
  • Ammoniacal silver nitrate
  • Phosphorus pentachloride.
Out of aldehyde and ketones, which is more reactive towards nucleophilic addition?
  • Aldehyde
  • Ketone
  • Equally reactive
  • Cannot be predicted
Which of the following is used for preserving biological specimens?
  • Formaldehyde
  • Ether
  • Ethyl alcohol
  • None of these
The IUPAC name of the compound is:
601747_2d19ab1a31524d4f82c5bcaf48e61ef8.png
  • 2,4-dimethylpentanoic acid
  • 2,3-dimethylpentanoic acid
  • 1,4-dimethylpentanoic acid
  • 3,4-dimethylpentanoic acid
_______ is/are used in the manufacture of bakelite polymer.
  • Propyl alcohol
  • Phenol
  • Formaldehyde
  • both B and C
Formalin is _______ % solution of formaldehyde in water
  • 10
  • 20
  • 40
  • 60
Acetone is used:
  • for extraction of essential oils
  • as a constituent of liquid nail polish
  • both A and B
  • none of these
Which of the following is the flavouring agent for food, beverages etc?
  • Acetone
  • Formaldehyde
  • Benzaldehyde
  • Phenol
Which of the following can be used as a solvent for cellulose acetate, cellulose nitrate, and celluloide?
  • Formaldehyde
  • Acetaldehyde
  • Acetic acid
  • Acetone
Benzaldehyde is used:
  • as a flavouring agent for food
  • in the manufacture of triphenylmethane dyes like malachite green
  • as a starting material for the preparation of cinnamic acid
  • all of these
In the following sequence, products $$I, J$$ and $$L$$ are formed. $$K$$ represents a reagent. The structures of compounds $$J$$ and $$K$$ respectively are:
32308_f6a5ec74f65343eda32f304bdceef397.PNG
The compound formed as a result of oxidation of ethyl benzene by KMnO$$_{4}$$ is:
  • benzophenone
  • acetophenone
  • benzoic acid
  • benzyl alcohol
On vigorous oxidation by permanganate solution, $$(CH_{3})_{2} C = CH - CH_{2} - CHO$$ gives___________.
  • $$CH_3-\!\!\!\underset{CH_3}{\underset{|}{\overset{\,\,\,\,CH_3}{\overset{|}{C}}}-}\overset{OH}{\overset{|}{C}H}-CH_2CH_3$$
  • $$(CH_{3})_{2}COOH$$, $$CH_{2}(COOH)_{2}$$
Which of the following acids are unsaturated one :
  • Stearic acid
  • Acrylic acid
  • Oleic acid
  • Crotonic acid
Observe the following reaction. the product P shows positive test towards neutral $$FeCl_{3}$$ , Q towards $$I_{2}/O^{\circleddash }H$$ and R towards fehling solution.
$$M\xrightarrow{DBr(Anhydrous)/ 1\ eq.}$$ Product is :

73070_9782374f86aa4bdd9ccb480349fc5005.png
The product $$X$$ is:
71660_f14bdaa742ae47d3b6a41c372e0e8d5e.png


Synthesis of propellane takes place by the above route. Product (x) in the above reaction sequence is :


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A carbonyl compound reacts with hydrogen cyanide to form cyanohydrin which on hydrolysis forms a racemic mixture of $$\alpha$$-hydroxy acid. The carbonyl compound is:
  • acetaldehyde
  • acetone
  • diethyl ketone
  • formaldehyde
Among the given compounds, the most susceptible to nucleophilic attack at the carbonyl group is:
  • $$CH_{3}COOCH_{3}$$
  • $$CH_{3}CONH_{2}$$
  • $$CH_{3}COOCOCH_{3}$$
  • $$CH_{3}COCl$$
Which of the following halides cannot be used in Wittg reaction?
  • $$(CH_{3})_{3}CCl$$
  • $$CH_{2}=CHCl$$
Which of the following is the characteristic smell of benzaldehyde?
  • Fish like smell
  • Bitter almond like
  • Pungent smell
  • Rotten egg like smell
Cyclohexene is best prepared from cyclohexanol by which of the following: 
  • conc. $$\mathrm{H}_{3}\mathrm{P}\mathrm{O}_{4}$$
  • conc. $$\mathrm{H}\mathrm{C}l/\mathrm{Z}\mathrm{n}\mathrm{C}1_{2}$$
  • conc. HCl
  • conc. HBr
Nucleophilic addition reaction will be most favoured in:
  • $$CH_{3}$$ - $$CH_{2}$$ - $$CH_{2}C$$ - $$CH_{3}$$
  • $$\left (CH_{3} \right)_{2}C$$ = $$O$$
  • $$CH_{3}CH_{2}CHO$$
  • $$CH_{3}CHO$$
An aromatic hydrocarbon has the molecular formula $$C_{10}H_{14}$$. Upon oxidation with boiling alkaline $$KMnO_{4}$$ followed by acidification, it yields benzene dicarboxylic acid. The total isomers for $$C_{10}H_{14}$$ are:
  • $$9$$
  • $$8$$
  • $$7$$
  • $$6$$
A hydrocarbon $$(A)$$ has the molecular formula $$({C}_{8}{H}_{10})$$. (A) is oxidized by a strong oxidizing agent to (B). (B) on dehydration and subsequent reaction with ammonia forms an imide, (C). (C) is then reacted with a strong inorganic base to form a compound that undergoes Hoffman bromamide reaction to give (D). (D) is treated with sodium nitrite in an ice cold acidic solution to form the product (E). (E) is a steam volatile compound and on nitration gives two mononitro derivatives. (E) is treated with sodium hydroxide to form the salt (F). On heating a solution of (F), bubble are formed due to release of gas. This gas does not burn. On analysis it was found that the gas has two components, one lighter than air and one heavier than air.

Compound $$(B)$$ is :
  • Phthalic acid
  • Isophthalic acid
  • Terephthalic acid
  • Benzoic acid
If (E) is reacted with acetaldehyde followed by acidification, product is.
  • acid
  • ketone
  • ether
  • alcohol
A carbonyl compound 'A' reacts with hydrogen cyanide to form a cyanohydrin 'B' which on hydrolysis gives an optically active alpha hydroxy acid 'C'. 'A' gives a positive iodoform test 'A', 'B' and 'C' are given by the set :-
2-methyl-1,3-cyclohexanedione is more acidic than cyclohexanone.
  • True
  • False
Which of the following statements are correct ?
  • Benzaldehyde reduces Fehling's solution
  • $$\displaystyle C_6H_5CHO + C_6H_5CHO \overset{NaOH}{\longrightarrow} C_6H_5CH = CHC_6H_5 + O_2$$ is a Claisen-Schmidt reaction.
  • $$pK_a$$ (formic acid) is less than $$pK_a$$ (acetic acid)
Which of the following compounds has very poor leaving group?
For the given reaction, which of these is correct?

263718_b2559235b7ec4876b291d5a3bd8939cb.png
  • $$L$$ must be better leaving group than $$Nu$$
  • $$Nu^-$$ must be strong enough nucleophile to attack carbonyl carbon
  • Carbonyl carbon must be enough electrophilic to react with $$Nu^-$$
  • All of these
Which of these statements are correct ?
  • Carbonyl compound is amphoteric in character
  • Acid catalyst makes the carbonyl carbon more electrophilic
  • basic catalyst makes the nucleophilic attack more faster.
  • All of these
Which of the statements are/is correct ? 
  • The rate determining step of addition reaction is the addition of nucleophile.
  • The rate-determining step is addition of electrophile.
  • The reaction intermediate of the reaction is alkoxide ion.
  • Both (A) and (C)
A carbonyl compound gives a positive iodoform test but does not reduce Tollen's reagent or Fehling's solution. It forms a cyanohydrin with HCN, which on hydrolysis gives a hydroxy acid with a methyl side chain. The compound is:
  • acetaldehyde
  • propionaldehyde
  • acetone
  • crotonaldehyde
Cyanohydrin of which of the following compound on hydrolysis gives optically active product?
  • HCHO
  • $$CH_3CHO$$
  • $$CH_3COCH_3$$
  • All the above
In this reaction: $$\displaystyle CH_{3}CHO+HCN \rightarrow CH_{3}CH(OH)CN \xrightarrow[] {H.OH}CH_{3}CH(OH)COOH$$, an asymmetric centre is generated. The acid obtained would be:
  • $$D$$ isomer
  • $$L$$ isomer
  • $$50\%$$ $$D$$ + $$50\%$$ $$L$$ isomer
  • $$20\%$$ $$D$$ + $$80\%$$ $$L$$ isomer
Carbonyl compounds show nucleophilic addition with :  
  • HCN
  • NaHSO$$_3$$
  • (CH$$_3$$OH + HCl)
  • all of these
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