CBSE Questions for Class 12 Engineering Chemistry Aldehydes,Ketones And Carboxylic Acids Quiz 9 - MCQExams.com

Among the following acids which has the lowest $$pKa$$ value
  • $$CH_3COOH$$
  • $$HCOOH$$
  • $$(CH_3)_2CH-COOH$$
  • $$CH_3CH_2COOH$$
Compounds $$(A)$$ and $$(B)$$ are:
1768336_3632c7e8f9144a0b85c1d432037bbfb8.png
The IUPAC name for the above compound is

1794705_8e5714fd35be4d4a8ed959a16e1f9ac1.png
  • 1-hydroxypentane-1,4-dione
  • 1, 4-dioxopentanol
  • 1-carboxybutan-3-one
  • 4-oxopentanoic acid
The general formula for aldehydes is $$C_nH_{2n+1}CHO$$. The value of n for the first member.
  • $$1$$
  • $$0$$
  • $$0.5$$
  • $$1.1$$
An organic compound X has the molecular formula $$C_3H_6O_2$$. It has a pleasant smell but does not turn blue litmus red. It has a structural formula.
  • both (a) and (b)
  • None of the above
The hybridization of carbonyl carbon in carbonyl compounds is 
  • $$ sp^2d $$
  • $$ sp^3 $$
  • $$ sp^2 $$
  • $$sp$$
The correct structure representation of carboxylate ion is
The IUPAC name for the formula
$$CH_{3} - \overset{CH_{3}} {\overset{|} {C}} = \overset{H} {\overset{|} {C}} - COOH $$
  • $$2$$-Methyl-$$2$$-butenoic acid
  • $$3$$-Methyl-$$3$$-butenoic acid
  • $$3$$-Methyl-$$2$$-butenoic acid
  • $$2$$-Methyl-$$3$$-butenoic acid
Fill in the blanks by suitable choices .
The carbon atom in carbonyl group is________ hybridised .The carbonyl group in aldehydes and ketones undergoes_______ reactions . Aldehydes which have $$\alpha  - H $$ atom undergo______ reaction . 
  • $$ sp^{3}$$ , nucleophilic substitutions , aldol condensation , Cannizzaro
  • sp , electrophilic substitution , Cannizzaro , aldol condensation .
  • $$ sp^{2}$$ , nucleophilic addition , aldol condensation Cannizzaro
  • $$ sp^{3}$$ electrophilic addition , Cannizzaro , aldol condensation .
$$CH_3 - \underset{O}{\underset{||}{C}} - OH \xrightarrow[]{NaH{\overset{14}{C}O_3}} (P \,gas) \xrightarrow[(2) H_3O^{\oplus}]{(1)PhCH_2MgBr} (Q)$$

$$CH_{ 3 }-\overset { O }{ \overset { || }{ \underset { O }{ \underset { || }{ S }  }  }  } -OH\xrightarrow [  ]{ NaH{ \overset { 14 }{ C } O_{ 3 } } } (R\, gas)\xrightarrow [ (2)H_{ 3 }O^{ \oplus  } ]{ (1)Ph{ \overset { 14 }{ C }  }H_{ 2 }MgBr } (S)$$
Product (Q) and (S) in the aove reactions are respectively:
  • $$PhCH_2COOH, Ph - \overset{14}{C}H_2 - \overset{O}{\overset{||}{\underset{O}{\underset{||}{S}}}} - OH$$
  • $$PhCH_2\overset{14}{C}OOH, Ph \overset{14}{C}H_2COOH$$
  • $$PhCH_2\overset{14}{C}OOH, Ph\overset{14}{C}H_2 \overset{14}{C}OOH$$
  • $$PhCH_2COOH, Ph\overset{14}{C}H_2 \overset{14}{C}OOH$$
The structure of the product $$S$$ is
By the action of malonic acid in ethanolic ammonia on benzaldehyde in the presence of pyridine, it forms:
  • Benzoic acid
  • Phenyl acetic acid
  • Cinnamic acid
  • Phthalic acid
In the following reaction sequence
What is X.
1752379_f93de06fc18d41178ec89865ad36a0ce.JPG
Which carbonyl group is protonated most readily in acidic solution, but gives nucleophilic addition by $$NH_{2}NH-Ph$$ least readily?
The following conversion reaction can be carried out by using reaction sequence/s.
1748785_92dc81da82374db485565d434a93af1b.png
  • $$KMnO_4 / OH^{\circleddash } / Heat$$
 
1748641_7497b8748cb24dafa2bb32e945aed0f2.PNG
The correct statement is
1748669_250da8435e684fc48446237bc53123e6.PNG
  • If $$(x)$$ is $$PhCH = O$$, then $$(z)$$ is also $$PhCH = O$$
  • If $$(x)$$ is $$PhCH = O$$, then $$(y)$$ is $$Ph - CH = CH - CH = CH - COOH$$
  • $$x$$ can be $$CH_3 - CH = O$$
 
1748597_f403c18283ee4fed968eaf94ee7838d4.PNG
  • $$CH_3CH (OH)_2, CH_3CH(OH)COOH$$
  • $$CH_3CHO, CH_3CH(OH)COOH$$
  • $$CH_3CH_2COOH, CH_3CH_2OH$$
  • $$CH_3CH(OH)COOH, CH_3CH_2OH$$

1761050_1288672b62ce4908b523a812947ddd1a.png
  • 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
In which of the following reactions correct major product is mentioned?
Which of the following products is/are correctly mentioned in the following reaction.
  • $$HCHO \xrightarrow[]{NaOD} HCOONa + CH_3OD$$
  • $$HCDO \xrightarrow[]{NaOD} DCOONa + CH_2DOH$$
  • $$HCDO \xrightarrow[]{NaOD} DCOOEt + DCH_3ONa$$
  • $$D_2CO \xrightarrow[]{NaOD} DCOONa + CD_3OD$$
Which of the following is a mixed ketone 
  • Pentanone
  • Acetophenone
  • Benzophenone
  • Butanone
What is the correct $$IUPAC$$ name for
1761188_0cc7cf4c8f9f4011a48d84aeecd33982.png
  • 5-methyl-3-hexenoic acid
  • 5-carboxy-2-methylpentene
  • 4-isotropyl-3-butenoic acid
  • None of these
The $$IUPAC$$ name for $$\begin{matrix} { CH }_{ 3 }CH={ CH }{ CH }_{ 2 }{ CH }{ CH }_{ 2 }COOH \\ \quad \quad| \\ \quad \quad{ CH }_{ 2 } \end{matrix}$$ is
  • $$5-$$aminohex$$-2-$$ene carboxylic acid
  • $$5-$$amino$$-2-$$heptenoic acid
  • $$3-$$amino$$-5-$$heptenoic acid
  • $$\beta -$$amini$$-\delta -$$heptenoic acid
What is the compound called if remaining two valencies of a carbonyl group are satisfied by two alkyl groups 
  • Aldehyde
  • Ketone
  • Acid
  • Acid chloride
Addition of alcohols to aldehydes in presence of anhydrous acid yield
  • Carboxylic acids
  • Ethers
  • Cyclic ethers
  • Acetals
Addition of alcohols to aldehydes in presence of anhydrous acid yield:
  • Carboxylic acids
  • Ethers
  • Cyclic ethers
  • Acetals
Compound $$(A)$$ is:
Carboxylic acid $$(A)$$ is:
  • Both (a) and (c)
$${CH}_{3}CH=CHCHO$$ is oxidised to $${CH}_{3}CH=CHCOOH$$ using:
  • Alkaline $$KMn{O}_{4}$$
  • Selenium dioxide
  • Ammoniacal $$Ag{NO}_{3}$$
  • All
Which of the following statements are correct?
  • Oximes are stronger acids than hydroxylamine
  • $$p{K}_{a}$$ of maleic acid is less than $$p{K}_{a}$$ of fumaric acid
  • $${Me}_{3}Si{CH}_{2}COOH$$ is a stronger acid than $${Me}_{3}C-{CH}_{2}COOH$$
  • o-Nitrobenzoic acid is a weaker acid than 3,5-dinitrobenzoic acid
Select the correct order in sequence in order to get the final product (E).
1769878_116886a25c7e42ddb7528e4f0278157c.png
  • $$(X)\, (U) \, (Z) \, (W) \, (U/X),(Y)$$
  • $$(X) \,(U) \,(Z) \,(V) \,(U/X),(Y)$$
  • $$(X) \,(Z) \,(W) \, (U/X),(Y) \,(V)$$
  • $$(X) \,(Z) \,(W) \,(U) \,(V)$$
Five isomeric p-substituted aromatic compounds (A) to (E) with molecular formula $$C_8H_8O_2$$ are given for identification. Based on the following observation, give the structures of the compounds.
i. Both (A) and (B) form a silver mirror with Tollens reagent. (B) also gives a positive test with neutral $$FeCl_3$$ solution.
ii. (C) gives positive iodoform test.
iii. (D) is readily extracted in aqueous $$NaHCO_3$$ solution.
iv. (E) on acid hydrolysis gives 1,4 - dihydroxy benzene.
Compound (D) is:

1768422_3309b4ec1b2f47618f5143abf6f3096f.png
  • 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 reactions are correct?
Which of the following is the correct repeseentaation for intermediate of nucleophilic addition reaction to the given carbonyl compound (A):
1797089_34df953cc95745caa7a5e8070c2d345b.png
Aldehyde and ketones do not react with 
  • Sodium bisulphide
  • Phenylhydrazine
  • Dihydrogen sodium phosphate
  • Semicarbazide
Which of the following reagent are not correctly matched with the reaction ?
  • $$ CH_{3}CH = CHCHO \rightarrow CH_{3}CH = CHCOOH :$$ Ammonical $$ AgNO_{3}$$
  • $$ CH_{3}CH = CHCHO \rightarrow CH_{3}CH =CHCH_{2}OH : H_{2}/Pt$$
  • $$ R - COOH \rightarrow R - CH_{2}OH : NaBH_{4}$$
  • $$ CH_{3}CH_{2}COCl \rightarrow CH_{3}CH_{2}CHO : H_{2}CH_{2}CHO : H_{2}, PD /NASO_{4} $$

Match column I with column II and mark the appropriate choice.
1847166_11840b48e6744115898a61a99e0a9030.PNG
  • $$ (A) \rightarrow (i) , (B) \rightarrow (ii) , (C) \rightarrow (iii) , (D) \rightarrow (iv)$$
  • $$ (A) \rightarrow (iv) , (B) \rightarrow (iii) , (C) \rightarrow (ii) , (D) \rightarrow (i)$$
  • $$ (A) \rightarrow (ii) , (B) \rightarrow (iv) , (C) \rightarrow (iii) , (D) \rightarrow (i)$$
  • $$ (A) \rightarrow (iii) , (B) \rightarrow (i) , (C) \rightarrow (ii) , (D) \rightarrow (iv)$$
$$ \alpha $$  - Hydroxypropanoic acid can be prepared from ethanal by following the steps given in the sequence .
  • Treat with HCN followed by acidic hydrolysis
  • Treat with $$ NaHSO_{3} $$ followed by reaction with $$ Na_{2}CO_{3}$$
  • Treat with $$ H_{2}SO{4}$$ followed by hydrolysis
  • Treat with $$ K_{2}Cr_{2}O_{7} $$ in presence of sulphurilic acid .
Identity reactant (X) in the given reaction sequence .
$$ \mathrm{CH_{3}COCH_{3} + X \rightarrow  (CH_{3}) _3C - (OMgCl) \overset{H_{2}O}{\rightarrow} (CH_3)_3C-OH}$$
  • $$ CH_{3}Mg Cl $$
  • $$ CH_{3}COCl + Mg $$
  • $$ Mg Cl_{2}$$
  • $$ CH_{3} CH_{2} MGCl $$
Study the following  sequence of reaction and identify the product (Y).
$$ CH_{3} CHO + HCHO \xrightarrow[heat]{dil . NaOH} X \xrightarrow[H_{3}O^{+}]{HCN} Y $$ 
The end product (Z) in the given sequence of reaction is
$$ CH_{3}CH = CHCHO \overset{NaBH_{4}}{\rightarrow} X \xrightarrow[ZnCl_{2}]{HCl} Y \xrightarrow[(ii)H^{+}]{KCN} Z$$ 
  • $$ CH_{3}CH = CHCH_{2}COOH $$
  • $$ CH_{3}CH_{2}CH_{2}COOH $$
  • $$ CH_{3}CH = CHCOOH $$
  • $$ CH_{3}CH (Cl)CH_{2}COOH $$
A compound (X) having molecular formula $$ C_{4}H_{8}O_{2}$$ is hydrolysed by water in presence of an acid to give a carboxylic acid (Y) and an alcohol (Z) . (Z) on oxidation with chrome acid gives (Y), (X), (Y) and (Z) are
  • X $$ CH_{3}COOCH_{3}$$
    Y $$ CH_{3}COOH$$
    Z $$CH_{3}OH $$
  • X $$ CH_{3}COOC_{2}H_{5}$$
    Y $$ CH_{3}COOH $$
    Z $$C_{2}H_{5}OH$$
  • X $$ C_{2}C_{5}COOCH_{3}$$
    Y $$ C_{2}C_{5}COOH $$
    Z $$C_{2}H_{5}OH $$
  • X $$ CH_{3}COOC_{2}H_{5}$$
    Y $$ C_{2}H_{5}COOH$$
    Z $$CH_{3}OH $$
Which functional group does $$CH_{3}COCH_{3}$$ contains ?
  • $$-CHO$$
  • $$-\overset {\overset {\displaystyle {\text O}}{||}} C-$$
  • $$-COOH$$
  • $$-OH$$
Product $$A$$ and $$B$$ for the following reactions are as follows:
2005440_eea78257b5f1466d9cd84e2867ba382a.png
  • None of the above
The IUPAC name of $$CH_{3}CH = CHCOOC_{2}H_{5} $$ is 
  • Ethyl but-1-enoate
  • Ethyl but-2-enoate
  • Ethyl prop-2-enoate
  • None of these
Cyclohexanone $$\xrightarrow{Cl_2/NaOH}$$   $$A$$$$\xrightarrow{i)NaOH/H_2O}$$ $$B$$                                                                
                                                                         
The product B and type of reaction occurs in conversion of A to B respectively are:
  • Cyclohexanecarboxylic acid, Beckmann Rearrangement
  • Benzoic acid, Wolf Rearrangement
  • Cyclopentanecarboxylic acid,  Favorskii Rearrangement
  • Cyclohexanecarboxylic acid, Curtius Rearrangement
$$CH_{3}OH \xrightarrow[(ii)\: Rh, \: \Delta]{(i)\: X} CH_{3}COOH$$
In the above reaction, $$X$$ is :
  • $$CO_{2}$$
  • $$CO$$
  • $$MgO$$
  • $$C$$
The compound(B) in the below reaction is:

$$C_{2}H_{5}Cl\overset{KCN}{\rightarrow}A\overset{H_{3}O^{+}}{\rightarrow}B$$
  • ethylene chloride
  • acetic acid
  • propionic acid
  • ethyl cyanide
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