CBSE Questions for Class 12 Engineering Chemistry Aldehydes,Ketones And Carboxylic Acids Quiz 14 - MCQExams.com

Which among the following carbonyl compound is most polar ? 
Cyanogen $$(CN)_2$$ on hydrolysis yields:
  • malonic acid
  • maleic acid
  • formic acid
  • oxalic acid
Which of the following cyanohydrins on hydrolysis give an optically active acid giving iodoform reaction?
  • Acetone cyanohydrin
  • Propionaldehyde cyanohydrin
  • Acetaldehyde cyanohydrin
  • Formaldehyde cyanohydrin
In the reaction $$\text{X}$$ is:

274079_e75663f8b8404dc089ca051096645fa7.png
  • $$CH_3CH_2COOH$$
  • $$CH_3COOH$$
  • $$CH_3CH_2CHO$$
  • $$CH_3CH_2OH$$
Propanoic acid is obtained by the hydrolysis of:
  • ethyl cyanide
  • acetyl chloride
  • acetamide
  • all of the above
Carbonyl compounds gives nucleophilic addtion with :
  • carbon nucleophile
  • oxygen nucleophile
  • Nitrogen nucleophile
  • All of these
$$(D)+Benzaldehyde\;\xrightarrow[(ii)\;H_2O^+]{(i)\;Pyridine,\;\Delta}\;Major\;Product\,(E)$$
The major product $$(E)$$ is
  • Crotomic acid
  • Cinnamic acid
  • Benzoic acid
  • Mandelic acid
The $$pK_{a}$$ values of four carboxylic acids are $$4.76, 4.19, 0.23$$ and $$3.41$$ respectively. The $$pK_{a}$$ value of strongest carboxylic acid among them is:
  • $$4.19$$
  • $$3.41$$
  • $$0.23$$
  • $$4.76$$
Acetic acid is prepared from ________.
  • formaldehyde
  • acetaldehyde
  • vinyl acetate
  • all of the above
Benzene carbaldehyde is reacted with concentrated $$NaOH$$ solution to give the products $$A$$ and $$B$$. The product $$A$$ can be used as food preservative and the product $$B$$ is an aromatic hydroxy compound where $$OH$$ group is linked to $$sp^3$$ hybridised carbon atom next to benzene ring. The products $$A$$ and $$B$$ respectively are :
  • sodium benzoate and phenol
  • sodium benzoate and phenyl methanol
  • sodium benzoate and cresol
  • sodium benzoate and picric acid
Common name of 3-chloro, 2-butyric acid is:
  • $$\alpha $$ - chloro, $$\beta $$-methyl butyric acid
  • $$\beta $$ - chloro, $$\alpha $$-methyl butyric acid
  • $$\alpha $$,$$\beta $$ - chloro methyl butryic acid
  • none of the above
Amongst the following compounds, the one(s) which readily react with ethanolic $$KCN$$?
  • Ethyl chloride
  • Chloro benzene
  • Benzaldehyde
  • Salicylic acid
The boiling point of aldehyde and ketones depend upon:
  • intermolecular dipole-dipole repulsion
  • intermolecular dipole-dipole attraction.
  • intermolecular induced dipole-dipole attraction.
  • none of these.
Which of the following acids does not contain $$-COOH$$ group?
  • Carbamic acid
  • Barbituric acid
  • Lactic acid
  • Succinic acid
Arrange the following compounds in the increasing order of their reactivity towards HCN.
I. Acetaldehyde
II. Acetone
III. Methyl-tert-butyl ketone
IV. Di-tert-butyl ketone
  • III < II < IV < I
  • II < I < IV < II
  • IV < III < II < I
  • II < IV < I < III
n-butyl benzene on oxidation will give:
  • benzoic acid
  • butanoic acid
  • benzyl alcohol
  • benzaldehyde
IUPAC name of the compound is:
591947.PNG
  • 3,4-Dihydroxybenzoic acid
  • 4,5-dihydroxybenzoic acid
  • 2,3-dihydroxybenzoic acid
  • none of these
$$R - CH_{2} - CH_{2} OH$$ can be converted into $$RCH_{2}CH_{2}COOH$$ by the following sequence of steps:
  • $$PBr_{3}, KCN, H_{2}/Pt$$
  • $$PBr_{3}, KCN, H_{3}O^{+}$$
  • $$HCN, PBr_{3}, H_{3}O^{+}$$
  • $$KCN, H_{3}O^{+}$$
4-nitrotoluene is treated with bromine to get compound '$$P$$' which is reduced with $$Sn$$ and $$HCl$$ to get compound '$$Q$$'. '$$Q$$' is diazotized and the product is treated with phosphinic acid to get compound '$$R$$'. '$$R$$' is oxidized with alkaline solution $$KMn{ O }_{ 4 }$$ to get the final product. Identify the final product.
  • 2-bromo-4-hydroxybenzoic acid
  • Benzoic acid
  • 4-bromobenzoic acid
  • 3-bromobenzoic acid
  • 2-bromobenzoic acid
Oxidation of cyclohexene in presence of acidic potassium permanganate leads to.
  • Glutaric acid
  • Adipic acid
  • Pimelic acid
  • Succinic acid
Trichloroacetaldehyde, $$ CC{ l }_{ 3 }CHO$$ reacts with chlorobenzene in presence of sulphuric acid and produces:
Which of the following is not a final product obtained by cross aldol condensation of ethanal and propanal?
  • 3-Methyl-but-2-enal
  • 2-Methyl-pent-2-enal
  • But-2-enal
  • Pent-2-enal
In the given reaction sequence :
874674_72dd80759179427cb0fae2b660a546ee.png
Among the following sets of reactants, which one produces anisole?
  • $$CH_{3}CHO; RMgX$$
  • $$C_{6}H_{5}OH; NaOH; CH_{3}I$$
  • $$C_{6}H_{5}OH; neutral\ FeCl_{5}$$
  • $$C_{6}H_{5} - CH_{3}; CH_{3}COCl; AlCl_{3}$$
Identify the structure of $$M$$ in the following sequence of reactions.
876713_ebc1943bf87c4161b1c985aef5948083.png
What is the formula of Acrolein?
  • $${ CH }_{ 2 }=CH-CHO$$
  • $${ CH }_{ 2 }=CH-CN$$
  • $${ CH }_{ 2 }=CN-COOH\quad $$
  • $${ CH }_{ 2 }=CH-CO{ NH }_{ 2 }$$
Which will undergo Friedel-Crafts alkylation reaction?
Which of the following reaction end with the same product?
876873_e36d55b19d704f67a54ca455cfd4170b.JPG
  • a, b, c
  • a, c
  • b, c
  • a, b
Which is the correct method of synthesising acetamide from acetone?
  • $$CH_3COCH_3\xrightarrow{Pd/BaSO_4}CH_3CHO\xrightarrow{NH_3}CH_3CH_2NH_2\xrightarrow{H_2O}CH_3CONH_2$$
  • $$CH_3COCH_3\xrightarrow[NaOH]{I_2}CH_3COONa\xrightarrow[NH_3]{H^+}CH_3COONH_4\xrightarrow{\Delta}CH_3CONH_2$$
  • $$CH_3COCH_3\xrightarrow{CrO_3}CH_3COOH\xrightarrow{NH_3}CH_3CONH_2$$
  • $$CH_3COCH_3\xrightarrow [NaOH]{I_2}CH_3COOH\xrightarrow {HCl}CH_3COCl\xrightarrow {NH_3}CH_3CONH_2$$
The addition of $$HCN$$ to carbonyl compounds is an example of:
  • nucleophilic addition
  • electrophilic addition
  • free radical addition
  • electromeric addition
Acetic acid is obtained when:
  • methyl alcohol is oxidised with potassium permanganate
  • calcium acetate is distilled in the presence of calcium formate
  • acetaldehyde is oxidised with potassium dichromate and sulphuric acid
  • glycerol is heated with sulphuric acid
Which of the following compound upon oxidation gives isophthalic acid?
  • p-Xylene
  • m-Xylene
  • o-Xylene
  • m-Cresol
$$CH_3-CH=CH-CHO  \xrightarrow[\Delta]{OH^{\circleddash}/H_2O}$$
The major product which can be isolated from this reaction is:
  • $$CH_3COOH$$
  • $$CH_3CHO$$
  • $$CH_3CH_2OH$$
Which of the following would be the best synthesis of $$2, 2-dimethyl$$ propanoic acid?
Which is the main functional group in Acrolein?
  • Aldehyde
  • Alkene
  • Nitrile
  • Ester
In the above scheme of reactions, $$"X"$$ is ?
879316_f82e71709a094f6492e35d451b4d5a6a.jpg
Compounds formed during formation of product B and the final product B is: 
878616_609d29cc45904579971e9a572f62ba28.jpg
Arrange the following compounds in increasing order of their reactivity in nucleophilic addition reactions.
Ethanal, Propanal, Propanone, Butanone
  • Butanone < Propanone < Propanal < Ethanal
  • Propanone < Butanone < Ethanal > Propanal
  • Propanal < Ethanal < Propanone < Butanone
  • Ethanal < Propanal < Propanone < Butanone
Above compound is hydrated maximum at which position?
996185_acc283282d7e4601bf2d3aa981690ed6.png
  • $$1$$
  • $$2$$
  • $$3$$
  • equal
$$Ph_2CH-\overset{O}{\overset{||}{C}}-H\overset{aqueous acid}{\rightarrow}\underset{81\%}{(A)}+\underset{2\%}{enol}+\underset{17\%}{aldehyde}$$
Product (A) of given reaction will be.
  • $$Ph-\underset{Ph}{\underset{|}{C}}=CH-O$$
  • $$Ph_2CH-\overset{OH}{\overset{|}{C}}H_2$$
  • $$Ph_2CH-\overset{OH}{\overset{|}{C}}H-OH$$
  • $$Ph_2CH-\overset{O}{\overset{||}{C}}-CH_3$$
Which of the following compounds are not oxidized by $$HIO_{4}$$?
992778_0feec9175fab49f2b00bf01d54a478e5.png
  • $$5, 6, 7$$
  • $$4, 5, 6, 7$$
  • $$6, 7$$
  • $$3, 4, 5, 6, 7$$
Product $$(D)$$ in above reaction is:
993120_c1529ed34f1b4b798e9f1204b0fd2969.png
Which of the following has lowest $$pK_a$$ value?
Given the major organic product of the following reaction.
993118_aa49546cca0a4793aa118ef631373f39.png
The compound $$(C)$$ is:
1068135_e886fd3ae1a44cc58e305de6ca0de775.png
The major product in the reaction of $$\alpha$$-bromo cyclohexanone with potassium ethoxide is?

The product of acid hydrolysis of [P] and [Q] can be distinguished by:
1103454_f39cf3018f324f9daaefaac62eb4d194.png
  • Lucas reagent
  • 2,4-DNP
  • Fehling's solution
  • $$NaHSO_{3}$$
Arrange the following compounds in decreasing order of reactivity towards nucleophilic addition reaction:

I) $${ C }_{ 6 }{ H }_{ 5 }COC{ H }_{ 3 }$$
II) $$C{ H }_{ 3 }-COC{ H }_{ 3 }$$
III) $$C{ H }_{ 3 }-CHO$$
  • I > II > III
  • III > II > I
  • II > I > III
  • III > I > II

Choose the compound D from the following.
1133105_1a3e845295264c3b81b5921ed8b90444.PNG
In the reaction CH$$_{3}$$OH $$\rightarrow$$ HCOOH, the number of electrons that must be addad to the right is :
  • 4
  • 3
  • 2
  • 1
0:0:1


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