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

The sodium salt of an organic acid 'X' produces effervescence with conc. $$H_2SO_{4}$$. 'X' reacts with the acidified aqueous $$CaCl_2$$ solution to give a white precipitate which decolorizes acidic solution of $$KMnO_4$$. 'X' is:
  • $$C_6H_5COONa$$
  • $$HCOONa$$
  • $$CH_3COONa$$
  • $$Na_2C_2O_4$$
When a nucleophile attacks a carbonyl group to form an intermediate, the hybridisation of the carbon atom changes from
  • $$sp^{3}$$ to $$sp^{2}$$
  • $$sp^{2}$$ to $$sp$$
  • $$sp$$ to $$sp^{2}$$
  • $$sp^{2}$$ to $$sp^{3}$$
In a set of reactions, ethylbenzene yielded a product D. D would be: 
1168285_ea42d0877213443088324b952abbb542.png
The IUPAC name of given compound is:
1172020_5a74c0e51f854188b6b07437dd252f16.png
  • 2-Chlorocarbonyl ethylbenzoate
  • 2-Carboxyethyl benzoyl chloride
  • Ethyl-2-(chlorocarbonyl) benzoate
  • Ethyl-1-(chlorocarbonyl) benzoate
A compound 'X' gives brisk effervescence of $$CO_2$$ on treatment with $$NaHCO_3$$ and when treated with $$LiAlH_4$$ gives ethyl alcohol. Therefore 'X' may be:
  • $$CH_3COCH_3$$
  • $$CH_3CH_2CHO$$
  • $$CH_3CHO$$
  • $$CH_3COOH$$
Give the decreasing order of nucleophilic addition reaction of the following :
(i) $$ { HCHO }$$                                        (ii)  $$PhCHO$$
(iii) Chloral  $$\left( \mathrm { Cl } _ { 3 } \mathrm { C } - \mathrm { CH } = O \right)$$       (iv) $$Acetophenone$$
  • $$(iii)>(i)>(ii)>(iv)$$
  • $$(iv) > (i i) > (i) > (iii)$$
  • $$(i) > (iii) > (ii )> (iv)$$
  • $$(iii)>(i)>(iv)>(ii)$$
Major product of the reaction is :
1201965_6b0b3614ab49438795c3eec21638fa47.png
One of the most common alcohol used for protection of carbonyl group is: 
  • Glycol
  • Glycerol
  • 1, 3-propanediol
  • Ethanol
IUPAC name is:
1202256_6f5ac4ca2522439087368c5e21e4ba1c.PNG
  • 4-Carboxy-5-methyl heptanoic acid
  • 1,3-Dicarboxy-4-methyl hexane
  • 4-(1-Methyl propyl)-pentane-dioic acid
  • 2-(1-Methyl propyl)-1,5-pentane-dioic acid
The conversion $${ CH }_{ 3 }CH=CHCHO\rightarrow { CH }_{ 3 }CH=CHCOOH$$ can be effected by
  • alkaline $${ KMnO }_{ 4 }$$
  • acidic $${ K }_{ 2 }{ Cr }_{ 2 }{ O }_{ 7 }$$
  • ammonical $${ AgNO }_{ 3 }$$
  • selenium dioxide
Identify  $$Z$$  in the following sequence.
1222290_5b3645397cfd4b1bbb7823613522e51a.png
  • $$\mathrm { CH } _ { 3 } \mathrm { COCl }$$
  • $$\mathrm { CH } _ { 3 } \mathrm { CONH } _ { 2 }$$
  • $$\mathrm { CH } _ { 3 } \mathrm { COOH }$$
  • $$\mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { COOH }$$
Starting from propanoic acid, the following reactions were carried out:

Propanoic acid $$ \quad \underrightarrow { { SOCl }_{ 2 } } \quad  {X} \quad  \underrightarrow  { { NH }_{ 3 } } \quad {Y} \quad \underrightarrow { { Br }_{ 2 } +KOH } \quad {Z}$$

What is compound Z?
  • $$CH_3 - CH_2 - Br$$
  • $$CH_3 - CH_2 - NH_2$$
  • $$CH_3 -CH_2 - CH_2 - NH_2$$
The major product "A" obtained in the given reaction is:
1200413_fd53eba33ad24c9f82360be44b5ca838.png
Which of the following has the most acidic hydrogen?
The IUPAC name of above compound is:
1307013_452ec8f41bb94a43af8d6eddbb320d7f.png
  • 1-Hydroxy-4-methyl-3-pentanone
  • 2-Methyl 5-hydroxy-3-pentanone
  • 4-Methyl 3-oxo-1 -pentanol
  • Hexan-1-one -3-ol
  
1233782_860dd4db9d0a4c24b5b13908a27c7cb8.png
$$CH_3-CH=CH-CHO \underrightarrow A$$
The best suitable reagent 'A' is
  • $$C_3H_8S_2/H_2/Ni$$
  • $$N_2H_4/KOH$$
  • $$Zn-Hg/Conc.HCl$$
  • $$H/P(red)$$
IUPAC name of given compound is:-
1293021_30a0ed70ca074c569e2ead6a0077efeb.PNG
  • $$6$$-Oxo-$$4$$-formyl cyclohexane carboxylic acid
  • $$4-$$ Formyl-$$2$$-oxo cyclohexane carboxylic acid
  • $$4$$- Formyl-$$2$$- oxo cyclohexanoic acid
  • $$1$$- Carboxy-4-formyl-2-oxo cyclohexane
The IUPAC name of given compound is:
1311915_81e8c177ad354b568eea415e4b2d1556.png
  • Ethoxy methanone
  • Ethoxy propanone
  • Ethyl-2-methyl propanoate
  • 2-methyl ethoxy propanone
Lowest $$pK_a$$ is associated with?
Consider the acidity of the carboxylic acids.
(i)  $$PhCOOH$$
(ii) o- $$NO_{2}C_{6}H_{4}COOH$$
(iii) p - $$NO_{2}C_{6}H_{4}COOH$$
(iv) m - $$NO_{2}C_{6}H_{4}COOH$$
which of the following order is correct ?
  • $$(i) > (ii) > (iii) > (iv)$$
  • $$(ii) > (iv) > (iii) > (i)$$
  • $$(ii) > (iv) > (i) > (iii)$$
  • $$(ii) > (iii) > (iv) > (i)$$
Which of the following is correct for  $$K_{a}$$  values. ( Acidic strength ) 
  • $$CH_{3}CO_{2}H > CH_{3}CH_{2}OH$$
  • $$H_{2}O > C_{2}H_{5}OH > NH_{3} > HC \equiv CH > CH_{2}\equiv CH_{2} > CH_{3}- CH_{3}$$
  • $$HCOOH > CH_{3}-COOH > PhCOOH$$
  • None of these
Compare acidic strength of the following compound :
1318127_fa12a891652849028608172587ea9270.png
  • $$P > Q > R$$
  • $$Q > P > R$$
  • $$R > P > Q$$
  • $$P > R > Q$$
A is :
1323027_ecd2efa0da2144bbb98bfedd94ec3b23.png
Which of the following form stable product with $$H_2O$$
  • $$H-CHO$$
  • $$All$$
The relative acidity of the indicated $$H$$ in each of the following is :
1320931_cab26d126f924b9ea74aae9ee24aa806.png
  • $$i > ii > iii$$
  • $$ii > iii > i$$
  • $$i > iii > ii$$
  • $$iii > i > ii$$
Which has most acidic proton from the following?
  • $$None\ of\ these $$
Which of the following is correct option of reagent for the given conversion? 
1340862_61720baed532457e8a73bb6d7d858fb6.PNG
  • $$Cl_{2}/hv,CH_{3}MgBr,Br_{2}/hv,CH_{3}COOH$$
The compound $$'A'$$ is
1340577_56327b1961084208986c9a04aa6ba5ba.PNG
The compound with the most acidic hydrogen is 
  • $$CH_{3}CHO$$
  • $$CH_{3}COCH_{3}$$
  • $$CH_{3}-CO-CH_{2}CO_{2}CH_{3}$$
Identify number of reagent that can be used for above conversion.
1365111_41060b8b6f0d4d50b346da28bc21fa60.png
  • Zn-Hg/HCl
  • $$LiAlH_{4}$$
  • $${ N }_{ 2 }{ H }_{ 4 }/\overset { \circleddash }{ O } H$$
Reactant $$(A)$$ and product $$(B)$$ are respectively:
1369150_db83050957de4672931e60c15d5eaf83.PNG
Arrange acidity of given four compounds in decreasing order :
(I) $$ CH_{ 3 }-\overset { \overset { O }{ || }  }{ C } -CH_{ 2 }-\overset { \overset { O }{ || }  }{ C-CH_{ 3 } }  $$
(II) $$ CH_{ 3 }-\overset { \overset { O }{ || }  }{ C } -CH_{ 3 } $$
(III) HC≡CH
(IV) $$ CH_3-CHO $$
Select correct answer from the codes given below 
  • I > IV > III > II
  • I > IV > II > III
  • III > I > IV > II
  • II > IV > I > III
The correct statement(s) regarding above reaction is/are
1374523_4295ef5f567d47b1b2dd52819b63d5d2.PNG
  • Final product is given as
  • The reaction is reversible in nature
  • The product is cyclic ketal
  • All of these

The IUPAC name of compound is:
1363301_36a4940aaed74916be8819bd6f3a507b.jpg
  • 2,2-diethyl pentanoic acid
  • 3,4-dimethyl hexanoic acid
  • 2-methyl-4-ethyl pentanoic acid
  • 4-ethyl-2-methyl pentanoic acid
Reaction of the following substance with nitric acid would yield:
1380080_f41aa03ba01549c0a5250ee690512462.PNG
The major product formed in the above reaction is:
1364192_3bb40105ee1149e1955ca6b7f58a8de2.JPG
  • Both A and B
Reactivity of alkenes towards HX decreases in the order -
  • Butene > Propene > Ethene
  • Butene > Ethene > Propene
  • Ethene > Propene > Butene
  • None of these
The $$IUPAC$$ name of the given compound is:
1453201_ad85b1f124b94e1cb66f219e35a9b9d3.png
  • $$2-$$(Hydroxy methyl) methyl propanedioate
  • $$Methyl-2-$$(hydroxy methyl) propanedioate
  • $$2-$$(Hydroxy methyl) dimethyl propanedioate
  • $$None\ of\ these$$
The most reactive compound towards formation of cyanohydrin on treatment with $$KCN$$ followed by acidification is:
  • Benzaldehyde
  • p-nitrobenzaldehyde
  • Phenyl acetaldehyde
  • p-hydroxy benzaldehyde
When benzaldehyde is heated with acetic anhydride in the presence of sodium acetate, the product obtained is
  • Cinnamic acid
  • Phenyl acetic acid
  • Benzoic acid
  • Benzoic anhydride
In the reaction, the products $$X$$ and $$Y ,$$ respectively, are-

1467619_4baf56a428a8469abed798103d0cc0eb.jpg
  • $$\mathrm { C } _ { 2 } \mathrm { H } _ { 5 } \mathrm { OH } , \mathrm { CH } _ { 3 } \mathrm { COOH }$$
  • $$\mathrm { CH } _ { 3 } \mathrm { OH } , \mathrm { HCOOH }$$
  • $$\mathrm { C } _ { 2 } \mathrm { H } _ { 5 } \mathrm { OH } , \mathrm { CH } _ { 3 } \mathrm { CHO }$$
  • $$\mathrm { C } _ { 2 } \mathrm { H } _ { 5 } \mathrm { OH } , \mathrm { HOCH } _ { 2 } \mathrm { CH } _ { 2 } \mathrm { OH }$$
Which substance is used in leather industry?
  • Methanoic acid
  • Ethanoic acid
  • Benzoic acid
  • Pentanoic acid
$${ CH }_{ 3 }CH=CHCHO$$ is oxidised to $${ CH }_{ 3 }-CH=CHCOOH$$, using oxidising agent as :
  • alkaline $$KMn{ O }_{ 4 }$$
  • $${ K }_{ 2 }{ Cr }_{ 2 }{ O }_{ 7 }/conc.{ H }_{ 2 }{ SO }_{ 4 }$$
  • ammoniacal $$Ag{ NO }_{ 3 }$$
  • dilute4 $$H{ NO }_{ 3 }$$
Which is/are examples of organic compounds containing the carbonyl group?
  • Aldehydes
  • Ketones
  • Carboxylic acid
  • All of these
In which of the following delocalisation of $$\pi$$-electrons is possible?
  • $$CH_2=CH-CH_2-CHO$$
  • $$CH_2=CH-CH=O$$
  • $$CH_2=CH_2$$
  • $$CH_2=CH-CH_2-CH=CH_2$$
IUPAC name of the given compound is:
1388870_c21a45a03e7c49e2a1da10cd7d517bea.png
  • Methyl salicylate
  • 2 - hydroxy-methylbenzoate
  • Methyl - o - hydroxybenzoate
  • Methyl - 2 - hydroxy salicylate
An organic compound $$x$$ which is used as a preservative in pickles on reaction with another organic compound $$y$$ used in the tincture in the presence of an acid gives a product which is a sweet-smelling substance $$z$$.  $$x , y , z$$ respectively are:
  • Ethanoic Acid,  Ethanol, Ethyl Acetate
  • Ethanol, Propanoic Acid, Ethyl Ethanoate
  • Ethanol, Carbolic Acid, Ethyl Ethanoate
  • None of the above
Lowest $$pK_{a}$$  is associated with 
Give a decreasing order of the following towards NA reaction.
1503909_857666fa9178406dad7dd8d710b9732f.JPG
  • $$( I ) > ( I I ) > ( I I ) > ( I V )$$
  • $$( I V ) > ( I I I ) > ( I I ) > ( I )$$
  • $$( I I ) > (I I I ) > ( I V ) > ( I )$$
  • $$( I ) > ( I V ) > ( I I ) > ( I I )$$
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