CBSE Questions for Class 12 Engineering Chemistry Aldehydes,Ketones And Carboxylic Acids Quiz 5 - MCQExams.com

Identify the combination of compounds that undergo Aldol condensation followed by dehydration to produce but-2-enal:
  • methanal and ethanal
  • two moles of ethanal
  • methanal and propanone
  • ethanal and propanone
In the following reaction, the compound $$Z$$ is:
1574668_b7b4264e6e9a4dfa8724865d0e3be3ff.GIF
  • benzoic acid
  • benzaldehyde
  • acetophenone
  • benzene
Lactic acid is formed, on hydrolysis of the cyanohydrin of
  • Methanal
  • Ethanal
  • Propanal
  • Propanone
Heptanol $$\underrightarrow { { CrO }_{ 3 }/{ H }_{ 2 }{ SO }_{ 4 } } \quad \quad ?$$ 
  • Heptanal
  • Heptanoic acid
  • Ethanal+ Proponal
  • None of these
The IUPAC name of the compound shown here is 
1566240_7f00538869bb4a59b10f8cb80df78687.JPG
  • 5-Ethyl -1- hydroxyoctan -1, 4-dioic acid
  • 2-Carboxyethyl -3- hexyl ketone
  • 3-(3-Hexylcarbonyl) propanoic acid
  • 5-Ethyl-4-oxooctanoic acid
Arrange the given compounds in decreasing order of nucleophilic addition reaction:
1586440_5e7567a2e0f248339cef92be3803d58e.PNG
  • II> V> I> IV> III
  • III> IV> I> V> II
  • II> I> V> III> IV
  • IV> III> V> I> II
The incorrect IUPAC name is 
  • $$\underset{2 - methyl -3-butanone}{CH_3 \underset{O}{\underset{||}{C}} - \underset{CH_3}{\underset{|}{C}}H - CH_3}$$
  • $$\underset{2, 3-dimethylpotane}{CH_3 \underset{CH_2}{\underset{||}{C}} - \underset{CH_2CH_3}{\underset{|}{C}}H - CH_3}$$
  • $$\underset{2 - pentyne}{CH_3C \equiv C - CH_2 CH_3}$$
  • $$\underset{2-bromo -3-chlore-butane}{CH_3\underset{Cl}{\underset{|}{C}}H - \underset{Br}{\underset{|}{C}}H - CH_3}$$
Greatest amount of hydration is in:
  • equal
Which of the following is correct order regarding the acidity of carboxylic acids?
  • $$\left( \mathrm { CH } _ { 3 } \right) _ { 3 } \mathrm { CCOOH } > \left( \mathrm { CH } _ { 3 } \right) _ { 2 } \mathrm { CHCOOH } > \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { COOH }$$
  • $$\left( \mathrm { CH } _ { 3 } \right) _ { 3 } \mathrm { CCOOH } > \left( \mathrm { CH } _ { 3 } \right) _ { 2 } \mathrm { CHCOOH } < \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { COOH }$$
  • $$\left( \mathrm { CH } _ { 3 } \right) _ { 3 } \mathrm { CCOOH } < \left( \mathrm { CH } _ { 3 } \right) _ { 2 } \mathrm { CHCOOH } > \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { COOH }$$
  • $$\left( \mathrm { CH } _ { 3 } \right) _ { 3 } \mathrm { CCOOOH } < \left( \mathrm { CH } _ { 3 } \right) _ { 2 } \mathrm { CHCOOH } < \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { COOH }$$
Which of the following is an example of nucleophilic addition to acetaldehyde?
  • Acetal formation
  • Cyanohydrin formation
  • Bisulphite adduct
  • Wolff-Kishner reaction
The major product of the given reaction is:
1614219_f7e7a54df8b9467daf77ce3f13c3e025.png
Consider the following reaction:
The compound $$D$$ is an ortho-isomer and E is a $$p-isomer$$. The compounds $$D$$ and $$E$$, respectively are :

245838.png
  • Phthalic acid and isophthalic acids
  • Isophthalic and phthalic acids
  • Terephthalic and phthalic acids
  • Phthalic and terephthalic acids
Give the products formed on reductive ozonolysis with LAH and oxidative ozonolysis with $$H_2O_2$$, from the compounds.
249375_fe88eda30d8048d480e3d46b3e11be7f.png
  • Propan-1,3-diol and propan-1,3-dioic acid
  • Propan-1,2-diol and propan-1,3-dioic acid
  • Propan-1,3-diol and propan-1,2-dioic acid
  • Propan-1,2-diol and propan-1,2-dioic acid
In the following sequence of reactions, products (A) to (H) are formed. Then the Compound (G) is :

249186_bf9e3ddfa4b54d9ca3ccd6934f07aa3e.png
$$P\xrightarrow {KMnO_{4}/KOH}Q\underset {\triangle}{\xrightarrow {Sodalime}} R \underset {anhy.\ AlCl_{3}}{\xrightarrow {CH_{3}Cl}} S$$

If $$P$$ and $$S$$ are toluene, $$Q$$ and $$R$$ ______ and ______ respectively.
  • Benzaldehyde, Benzoic acid
  • Benzaldehyde, Sodium benzoate
  • Benzoic acid, Benzene
  • Benzene, Benzoic acid
Propanoic acid occurs naturally as a result of the bacterial fermentation of milk and is partly responsible for the flavour of Swiss cheese.
Which starting materials can be used to produce propanoic acid?
$${CH}_{3}{CH}_{2}{CH}_{2}OH$$
$${CH}_{3}{CH}_{2}CHO$$
$${CH}_{3}{CH}_{2}CN$$
1649062_612d51c766354e439dad7ef11c6f625c.png
  • 1, 2 and 3 are correct
  • 1 and 2 only are correct
  • 2 and 3 only are correct
  • 1 only is correct
Which among the following compounds is used as selective weed killer?
  • Picric acid
  • $$2, 4$$-dichlorophenoxy acetic acid
  • $$2, 4, 6$$-trichlorophenoxy acetic acid
  • Salol
Cumene on treatment with $${KMnO_4}$$ gives:-
  • A
  • B
  • C
  • D
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • Assertion is correct but Reason is incorrect
  • Both Assertion and Reason are incorrect
Which of the following cannot be used as reagent (B) ?
250311.jpg
  • $$CH_3O\ominus$$ at high temperature
  • $$C_2H_5O^\ominus$$ at high temperature
  • $$CsOH + C_2H_5OH$$
$${pK_a}$$  and $${K_a}$$ of an acid are connected  by the relation ---------
  • $${pk_a}$$ = $${log k_a}$$
  • $${pk_a}$$ = $${- pH}$$
  • $${pk_a}$$ = $${- log k_a}$$
  • $${pk_a}$$ = $${- log k_b}$$
In the reaction
The product (A) is :

263658.jpg
Cynohydrin of which of the following compound can give lactic acid
  • $$HCHO$$
  • $$CH_{3}COCH_{3}$$
  • $$CH_{3}CHO$$
  • $$CH_{3}CH_{2}CHO$$
In the reaction $$C_6H_6\, \xrightarrow[AlCl_3]{CH_3Cl}\, A\, \xrightarrow{KMnO_4}\, B$$ 
$$B$$ is:
  • benzoic acid
  • benzoyl chloride
  • benzaldehyde
  • chlorobenzene
The IUPAC name for the compound is:
275133_3aff96c8abfb41a48aad5b94a9ed0713.PNG
  • 2-acetyl prop-1-ene
  • pent-1-en-4-one
  • Pent-4-en-2-one
  • formyl propene
Polarisation of electron in acrolein $$\left(C{H}_{2}=CH-CH=O\right)$$ or resonance hybrid of acrolein can be written as:
$$HBr$$ fails to give addition products with carbonyl compounds.
Is the above statement true?
  • True
  • False
Aldehydes on oxidation gives_________
  • Alcohol
  • Acid
  • Ketone
  • Ether
3-Methyl-2-pentanone is :
Cyanohydrin of which of the following compound on hydrolysis gives optically active products?
  • $$HCHO$$
  • $$CH_{3}CHO$$
  • $$CH_{3}COCH_{3}$$
  • all of the above
Quinaine is obtained from-
  • Bark
  • Fruit
  • Leaves
  • Roots
Acetylsalicylic acid is a pain killer and is commonly known as
  • paracetamol
  • aspirin
  • ibuprofen
  • penicillin
Functional group of carboxylic acid is:
  • $$RO-$$
  • $$-C-OH$$
  • $$-OH$$
  • $$ -COOH$$
Ethanol on reaction of acidified potassium dichromate form:
  • ethane
  • ethene
  • ethanal
  • ethanoic acid
Chlorinaton of toluene in the presence of light and heat followed by treatment with aqueous NaOH gives
  • o-cresol
  • p-cresol
  • salt
  • benzoic acid
The major product in the following at $$25^oC$$ is: $$CH_3COOH\xrightarrow {CH_3CH_2NH_2}$$
  • $$CH_3CONHCH_2CH_3$$
  • $$CH_3CH=NCH_2CH_3$$
  • $$NH_3^+CH_2^-CH_3.CH_2COO^-$$
  • $$CH_2CON=CHCH_3$$
The order or reactivity of phenyl magnesium bromide with the following compounds is:
(I) $$CH_3-\overset{\displaystyle O}{\overset{\displaystyle ||}{C}}-CH_3$$
(II) $$H-\overset{\displaystyle O}{\overset{\displaystyle ||}{C}}-CH_3$$
(III) $$Ph-\overset{\displaystyle O}{\overset{\displaystyle ||}{C}}-Ph$$
  • (II)> (III) > (I)
  • (I) > (III)> (II)
  • (II) > (I) > (III)
  • all react with the same rate
Out of the following the one that undergoes reaction with 50% NaOH solution to give corresponding alcohol and acid is:
  • phenol
  • benzaldehyde
  • butanol
  • benzoic acid
Among the following acid which has the lowest $$pK_a$$ ?
  • $$CH_3CH_2COOH$$
  • $$(CH_3)_2CH-COOH$$
  • $$HCOOH$$
  • $$CH_3COOH$$

$$A$$ reacts with $$NaOI$$ followed by the reaction with $$H^+$$ to give $$3,\,4-$$dihydroxybenzoic acid. What is $$A$$ ?
306081_554fb255a09a440aa67b76c3a9e418a6.png
In deodorant soaps, the additive added is:
  • glycerol
  • stearic acid
  • potassium bicarbonate
  • 3,4,5-tribromo salicylaldehyde
$${ CH }_{ 3 }CHO+HCHO\xrightarrow [ Dil.\ NaOH ]{ Heat } A\xrightarrow [ HCN ]{ { { H }_{ 3 }O }^{ + } } B$$

The structure of compound $$B$$ is :
  • $$CH_3-\underset{OH}{\underset{|}{C}H}-COOH$$
  • $$CH_2=CH-\underset{CN}{\underset{|}{C}H}-OH$$
  • $$CH_3CH_2-\underset{OH}{\underset{|}{C}H}-COOH$$
  • $$CH_2=CH-\underset{OH}{\underset{|}{C}H}-COOH$$
Ethyl ethanoate on reacting with excess of $${CH}_{3}MgBr$$ will give
  • acetone
  • 2-methyl-2-propanol
  • isobutanol
  • n-butyl alcohol
Identify the compounds which give yellow precipitate with $${I}_{2}+NaOH$$
(a) Ethyl alcohol   (b) Acetone
(c) Propyl alcohol   (d) 2-propanol
(e) 3- butanone     (f) Butanal
  • c, e and f
  • a, d and f
  • e, f and a
  • a, b and d
Which of the following acids is hydroxy acid?
  • Maleic acid
  • Succinic acid
  • Lactic acid
  • Adipic acid
In the sequence of reaction: $$C_2H_2\xrightarrow[HgSO_4]{H_2SO_4}A\overset{[O]}{\longrightarrow}B$$ 
The compound B is:
  • ethanoic acid
  • propanone
  • ethanol
  • methanal
You can make an organic acid from ethanol and that is:
  • $$\displaystyle { C }_{ 3 }{ H }_{ 7 }OH$$
  • found in bees and ants
  • acetic acid
  • formic acid
  • butanoic acid
The $$\displaystyle p{ K }_{ a }$$ values of four carboxylic acids are given below. Identify the weakest carboxylic acid.
  • 4.89
  • 1.28
  • 4.76
  • 2.56
A tripeptide is written as glycine-alanine-glycine. The correct structure of the tripeptide is:
Structure of ethanoic acid is:
  • $$\displaystyle { CH }_{ 3 }-{ CH }_{ 2 }-{ CH }_{ 3 }$$
  • $$\displaystyle CH_3-\underset {\displaystyle \underset {\displaystyle O}{ ||}}{C}-OH$$
  • $$\displaystyle { CH }_{ 3 }-O-{ C }_{ 3 }{ H }_{ 7 }$$
  • $$\displaystyle CH_3-\underset {\displaystyle \underset {\displaystyle O}{ ||}}{C}-CH_3$$
  • $$\displaystyle CH_3 - CH_2- NH_2$$
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