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

An aldehyde can give nucleophilic addition reaction with: 
  • $$ HCN $$
  • $$ NaHSO_3 $$
  • $$ R-MG-X $$
  • $$ NH_2NH_2 $$
Which of the following statements is not correct? 
  • Aldehydes and ketones contain polar carbonyl group
  • Aldehydes and ketones undergo nucleophilic addition
  • Aldehydes and ketones undergo electrophilic substitution
  • Lower members of aldehydes and ketones are soluble in water due to hydrogen bonding
Which gives nucleophilic addition reactions? 
  • Methanal
  • Ethanal
  • Propanone
  • None of these
Acetone gives addition elimination reaction with: 
  • $$ NH_2OH $$
  • $$ NaHSO_3 $$
  • $$ NH_2NHCONH_2 $$
  • $$ NH_2NHC_6H_5 $$
Acetaldehyde reacts with both nucleophiles and electrophiles. 
  • True
  • False
Which of the following compounds will give carboxylic acid with nitrous acid $$ (HNO_2)? $$
  • R-COCl
  • $$ R-CONH_2 $$
  • R-COOR
  • $$ (RCO)_2O $$
Oil of vanilla bean is
The structures of the products $$Q$$ and $$R$$, respectively, are
The structure of the carbonyl compound $$P$$ is
The structure of the product $$S$$ is
Which of the following compund(s) is/are peroxy-acids?
  • $$ HClO_4 $$
  • $$ H_2SO_5 $$
  • $$ H_2S_2O_8 $$
  • $$ H_3PO_5 $$
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

Compound ' P ' of the following reaction sequence can be:
1748181_2958e0a423ed49e79d9a76bbf23b220c.PNG
$$CH_3 - \underset{O}{\underset{||}{C}} - OH \xrightarrow[]{NaH{\overset{14}{C}O_3}} (P \,gas) \xrightarrow[(2) H_3O^{\oplus}]{(1)PhCH_2MgBr} (Q)$$

$$CH_{ 3 }-\overset { O }{ \overset { || }{ \underset { O }{ \underset { || }{ S }  }  }  } -OH\xrightarrow [  ]{ NaH{ \overset { 14 }{ C } O_{ 3 } } } (R\, gas)\xrightarrow [ (2)H_{ 3 }O^{ \oplus  } ]{ (1)Ph{ \overset { 14 }{ C }  }H_{ 2 }MgBr } (S)$$
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 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
  • $$CH_3CH (OH)_2, CH_3CH(OH)COOH$$
  • $$CH_3CHO, CH_3CH(OH)COOH$$
  • $$CH_3CH_2COOH, CH_3CH_2OH$$
  • $$CH_3CH(OH)COOH, CH_3CH_2OH$$
In which of the following reactions correct major product is mentioned?
What is the compound called if remaining two valencies of a carbonyl group are satisfied by two alkyl groups 
  • Aldehyde
  • Ketone
  • Acid
  • Acid chloride
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
Addition of alcohols to aldehydes in presence of anhydrous acid yield
  • Carboxylic acids
  • Ethers
  • Cyclic ethers
  • Acetals
$$CH_3CONH_2\xrightarrow[]{NaNO_2IHCI}X$$
  • $$CH_3COOH$$
  • $$CH_3CO \overset{+}{N}H_3CI^{-}$$
  • $$CH_3NH_2$$
  • $$CH_3CHO$$
Addition of alcohols to aldehydes in presence of anhydrous acid yield:
  • Carboxylic acids
  • Ethers
  • Cyclic ethers
  • Acetals

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
Carboxylic acid $$(A)$$ is:
  • Both (a) and (c)
Compound $$(A)$$ is:
$${CH}_{3}CH=CHCHO$$ 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
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?
Select the correct order in sequence in order to get the final product (E).
1769878_116886a25c7e42ddb7528e4f0278157c.png
  • $$(X)\, (U) \, (Z) \, (W) \, (U/X),(Y)$$
  • $$(X) \,(U) \,(Z) \,(V) \,(U/X),(Y)$$
  • $$(X) \,(Z) \,(W) \, (U/X),(Y) \,(V)$$
  • $$(X) \,(Z) \,(W) \,(U) \,(V)$$
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
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