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

Which acid is used as table vinegar?
  • Formic acid
  • Acetic acid
  • Picric acid
  • None of these
Which of the following is used as an acid bath in dyeing cotton and wool?
  • Methanoic acid
  • Acetic acid
  • Benzoic acid
  • Sulphuric acid
$$C_nH_{2n-1}COOH$$ is the general formula for:
  • saturated fatty acids
  • unsaturated fatty acids
  • simple lipids
  • phospholipids
Find a wrong statement from the given statements.
  • oxalic acid is used for making metal polish
  • benzoic acid is used in manufacture of dyes
  • oxalic acid in form of ferrous potassium oxilate used as developer in photography
  • benzoic acid is used for making metal polish
Which of the following carbonyl compounds is most polar?
  • $$C_2H_5-{\overset{O}{\overset{||}{C}}}-C_2H_5 $$
  • $$CH_3-{\overset{O}{\overset{||}{C}}}-CH_3 $$
  • $$CH_3-{\overset{O}{\overset{||}{C}}}-H $$
  • $$H-{\overset{O}{\overset{||}{C}}}-H $$
One girl student uses the liquid compound to remove nail paint from her nail. The liquid compound removes the nail paint from her nail. Give the name of this compound.
  • Acetic acid
  • Formalin
  • Ethanol
  • Propanone
IUPAC name of valeric acid is:
  • Propanoic acid
  • Butanoic acid
  • Ethanoic acid
  • Pentanoic acid
Which of the following chemical is used in making metal polishes:
  • oxalic acid
  • methanoic acid
  • both A and B
  • none of these
Tollen's reagent is:
  • ammoniacal cuprous chloride
  • ammoniacal cuprous oxide
  • ammoniacal silver nitrate
  • ammoniacal silver chloride
Which of the following is not a use of benzoic acid?
  • Food preservative
  • Anticeptic
  • In manufacture of dye
  • In metal polish
Acid present in honey bee sting is:
  • formic acid
  • propanoic acid
  • butanoic acid
  • none of these
State the oxidation number of carbonyl carbon in methanal and methanoic acid respectively:
  • $$0$$ and $$0$$
  • $$0$$ and $$+2$$
  • $$+1$$ and $$+2$$
  • $$+1$$ and $$+3$$
The general formula $${ C }_{ n }{ H }_{ 2n }{ O }_{ 2 }$$ could be for open chain
  • Diketones
  • Carboxylic acid
  • Diols
  • Diadehydes
Which of the following statements is incorrect regarding the reaction?

$$CH_3CHO+[Ag(NH_3)_2]^{\oplus} + \bar{OH} \rightarrow CH+3COO^-+Ag$$
  • The equivalent weight of $$CH_3CHO$$ is 22
  • Three moles of $$OH^-$$ are required in the above reaction
  • $$CH_3CHO$$ is an oxidising agent
  • Reduction of $$[Ag(NH_3)_2]^{\oplus}occurs$$
Reduction of ketones cannot be carried out with which of the following reagents?
  • Zinc amalgam and concentrated HCl
  • Hydrazine and KOH in ethylene glycol
  • Sodium borohydride or Lithium Aluminium hydride
  • Hydrogen in presence of palladium in Barrium sulphate and quinoline
Which of the following statements is not true for acetaldehyde ? 
  • It will undergo an aldol condensation reaction.
  • It will undergo a Cannizzaro reaction.
  • It will undergo a haloform reaction
  • Enolisation is catalysed by acid or base.
Which of the following is crossed aldol product in the reaction?
$$CH_3CHO+CH_3CH_2CHO\xrightarrow[25^oC]{OH^-}$$ $$'P'$$
When a nucelophile encounters a ketone the site of attack is:
  • The carbon atom of the carbonyl
  • The oxygen atom of the carbonyl
  • Both the carbon and oxygen atoms with equal probability
  • No attack occurs-ketones do not react with nucleophiles
$$A\xrightarrow [  ]{ HCN } B\xrightarrow [  ]{ { H }_{ 3 }{ O }^{ + } } Lactic \ acid$$
Identify $$A$$.
  • $$HCHO$$
  • $${ CH }_{ 3 }CHO$$
  • $${ C }_{ 6 }{ H }_{ 5 }CHO$$
  • $${ CH }_{ 3 }CO{ CH }_{ 3 }$$
IUPAC name of the above compound is:
770157_145e5beff6a5411cb3132970a63b3cfd.png
  • bicyclo[3,2,1]-octan-2-oic acid
  • bicyclo-[3,2,1]-octane-8-carboxylic acid
  • bicyclo-[3,2,1]-octan-8-oic acid
  • none of these
Identify $$A$$ and $$B$$ in the reaction given below.

$$\text{Ethane nitrile} \xrightarrow[\begin{matrix} aq\,H_2SO_4\\+2H_2O \\-NH_3 \end{matrix}]{Hydrolysis}A \xrightarrow[\begin{matrix}Sodalime \\\Delta \\-CO_2\end{matrix}]{Decarboxylation}B$$
  • Acetic acid, methnol
  • Acetone, methane
  • Ethanoic acid, ethane
  • Ethanoic acid, methane
What is the structural formula of fumaric acid?
Which molecule will give the following dicarboxylic acid on heating with acidic solution of $$KMnO_4$$?

992297_0197fdf6cba64a45ba88230989b93b85.JPG
What is the oxidation number of carbonyl carbon in acetophenone?
  • $$+3$$
  • $$+1$$
  • $$+2$$
  • Zero
Artificial sweetening agent is prepared from the strategy. Identify the structure of final product.
718548_472963f3491d44f88e125fa4bedc752b.png
Find the major product.
874343_26a9311dcc5a4a5b8f92f9fb5ce74b65.png
What is the final product C?
856453_0ab0a0dde9e041e88126c9bfa50b06d8.png
Which oxidised product is obtained when benzene diazonium chloride reacts with ethanol?
  • Acetaldehyde
  • Phenol
  • Benzaldehyde
  • Benzene
Which of the following acid does not have $$-COOH$$ gourp?
  • Ehtanoic acid
  • Picric acid
  • Benzoic acid
  • Salicylic acid
$$CH_{3} - CH_{2} - COOH\underset {Red\ P}{\xrightarrow {Cl_{2}}} A \underset {H_{3}O}{\xrightarrow {NaCN}} B\xrightarrow {\triangle}C$$, '$$C$$' is____________.
  • 2-methylpropan dioic acid
  • Propanoic acid
  • Lactic acid
  • Hexanoic acid
In which of the following compounds the prefix for side chain attached to the parent chain\ring is correct?
Consider the following sequence of reactions.
The products $$(A)$$ and (B)(B) are:
872838_9cb3d4ebef914a999a1775230164fbed.png
The product of given reaction is:
872926_44b84f7e774f4fd5a293a189405945b1.png
Which of the following is the correct reactant for the given reaction?
876644_dce3d3525811424abe87760862ab4e9a.png
  • None of these
In the given transformation, which of the following is the most appropriate reagent?
881569_367105d6960f4e59a7c7de107fa56ff9.png
  • $${ NH }_{ 2 }{ NH }_{ 2 },\ OH$$
  • $$Zn\ -Hg/HCl$$
  • $$Na,\ liq.\ { NH }_{ 3 }$$
  • $$NaB{ H }_{ 4 }$$
Tartaric acid is a colourless, crystalline acid found in fruit juices, like that of grapes. Some of its uses are mentioned here. Pick the false one:
  • In photography
  • In cosmetics
  • In dyeing of cloth
  • In medicines
What will be the most reactive among the following carbonyl compounds with Grignard's reagent?
Ionic species are stabilised by the dispersal of charge, which of the following carboxylate ions is the most positive charge?
  • $$CH_{ 3 }-\overset { \underset { || }{ \displaystyle \text {O} } }{ C } -\overset { - }{ O } $$
  • $$Cl-CH_{ 2 }-\overset { \underset { || }{ \displaystyle \text {O} } }{ C } -\overset { - }{ O } $$
  • $$F-CH_{ 2 }-\overset { \underset { || }{ \displaystyle \text {O} } }{ C } -\overset { - }{ O } $$
  • $$F-\underset{\underset{\displaystyle \text {F}}{|}}{C}H_{ 2 }-\overset { \underset { || }{ \displaystyle \text {O} } }{ C } -\overset { - }{ O } $$
The major product of the following reaction sequence is ?
878756_c50c512d9bd84e0288ccfb1bdf99b400.png
$$B$$ is ?
878515_1fc042bd321e4c3e80521a66ff9135ef.jpg
$${({C}_{2}{H}_{5}))}_{2}CO\xrightarrow [ { CH }_{ 3 }MgBr\ (excess) ]{ { H }_{ 3 }{ O }^{ + } }  A$$. $$A$$ (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 $$C$$
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
$$\alpha$$-Hydroxypropanoic acid can be prepared from ethanal by following the steps given in the sequence. 
  • Treat with $$HCN$$ followed by acidic hydrolysis
  • Treat with $$NaHSO_4$$ followed by reaction with $$Na_2CO_3$$
  • Treat with $$H_2SO_4$$ followed by hydrolysis
  • Treat with $$K_2Cr_2O_7$$ in presence of sulphuric acid
Which among the following is most reactive to give nucleophilic addition?
  • $$FCH_2CHO$$
  • $$ClCH_2CHO$$
  • $$BrCH_2CHO$$
  • $$ICH_2CHO$$
Choose the correct statement regarding the physical properties of carbonyl compound.
  • All aldehydes are insoluble in benzene
  • Higher aldehydes are more fragrant
  • n-Butane has more boiling point than acetone
  • Methanal and propanone are immiscible with water in all proportions
Which of the following reactions does not occur? 
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. $$CH_3COCH_3\xrightarrow[heat]{I_2+NaOH} X \xrightarrow[heat]{Ag} Y \xrightarrow[heat]{H_2SO_4/HgSO_4} Z$$
  • $$ X = CHI_3, \, Y = CH_3CHO, \, Z = HCHO$$
  • $$ X = CHl_3, \, Y = CH_3OH, \, Z = CH_3CHO$$
  • $$ X = CHl_3, \, Y = CH\equiv CH, \, Z = CH_3CHO$$
  • $$X = CH_3COCl_3, \, Y = CH_2=CH_2, \, Z = CH_3CHO$$

Product A in the given reaction is:
992141_da753e0ceecd48d28137cc872cc5c497.png
0:0:1


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