CBSE Questions for Class 12 Engineering Chemistry Aldehydes,Ketones And Carboxylic Acids Quiz 11 - MCQExams.com

An organic compound containing $$-COOH$$ functional group is called:
  • aldehyde
  • ketone
  • amide
  • carboxylic acid
  
1067411_3ef4b043d84648708d2f5a63501b9fdf.png
The suitable reagent(s) will be:
1068087_d11dcca436634d528e88d7e9f0b0956a.png
  • $$CrO/{H}_{2}O/$$ acetone
  • $$[Ag(NH_3)_2)^{\oplus} (aqueous), H^+$$
  • $$CrO/HCl/$$ pyridine
  • $$\overset{\,\,\,\,\,\,\,\,\,\,\,\,\,\,COONa}{\overset{|}{\underset{\!\!\!\,\,\,\,\,\,\,\,\,\,\,\,COOK}{\underset{|}{(CHOH)_2}}}} + CuSO_4 + NaOH, \, H^+$$
Corrosive sublimate ($$Hg{Cl}_{2}$$) can be used to distinguish between:
  • formaldehyde and propanone
  • formic acid and acetic acid
  • acetaldehyde and butanone
  • all of the above
Which of the following compounds will give butanone on oxidation with alkaline $$KMn{O}_{4}$$ solution?
  • Butan-1-ol
  • Butan-2-ol
  • 2-methylpropan-2-ol
  • None of these
Odd one out among the following is:
  • Tartaric acid
  • Oxalic acid
  • Citric acid
  • Prussic acid
Structure of $$(x)$$ is:
1070942_37ec37375d8a477eb432a56e726f68b0.png
$$C$$. Compound $$(3)$$ is:
1071178_40351c48baae401090fa068054423c95.png
Most acidic hydrogen is present in :
  • $$(CH_{3}CO)_{3}CH$$
  • $$(CH_{3})_{3}COH$$
The product of following reaction is:
1075770_f3c685d171f64938a8d221314fbdc9f6.png
Which of the following reactions is/are not correct to get cinnamic acid?
  • $$C_{6}H_{5}CHO\xrightarrow [ \left( { CH }_{ 3 }CO \right) _{ 2 }O/CH_{ 3 }COONa ]{ } $$
  • $$C_{6}H_{5}CHO\xrightarrow[{2)H_{3}O^{+},\Delta} ] {1)CH_{2}(COOC_{2}H_{2})_{2},pyridine}$$
  • $$C_{6}H_{5}CHO\xrightarrow{CH_{3}CHO/OH^{-}}{}$$
  • $$C_{6}H_{5}CHO\xrightarrow[{2)H_{2}O/H^{+}/ \Delta}]{1)BrCH_{2}COOC_{2}H_{3}/ZnI \Delta}$$
Which will form two oximes with $$NH_{2}OH$$?
  • $$CH_{3}CHO$$
  • $$CH_{3}COCH_{2}CH_{3}$$
  • $$HCHO$$
  • $$CH_{3}COCH_{2}CH_{2}CH_{2}$$
$$CH_{3}CH=CHCHO\overset { { OH }^{ - } }{ \underset { Aldol }{ \longrightarrow  }  } {  }A$$, $$A$$ is?
  • $$CH_{3}(CH=CH)_{3}CHO$$
  • $$CH_{3}CH_{2}CH_{2}(CH=CH)_{2}CHO$$
  • $$CH_{3}(CH_{2}CH_{2})CH=CH-CHO$$
  • $$None\ of\ the\ above\ is\ correct$$
________ is used in the preparation of chloroform, sulphonal, cordite etc.
  • formalin
  • ethyl alcohol
  • acetone
  • none of these
Formaldehyde is used :
  • for preserving biological specimens
  • for the preparation of urotropine
  • in the manufacture of bakelite
  • all of these
Which of the following statement is true?
  • Benzaldehyde is used in perfumery industry
  • Formaldehyde is used for silvering mirrors
  • Acetone is used as a commercial solvent
  • All of the above
Which of the following is used as an acid bath in dyeing cotton and wool?
  • Methanoic acid
  • Acetic acid
  • Benzoic acid
  • Sulphuric acid
Which of the following chemical is used in removing ink stain from clothes?
  • Ethyl alcohol
  • Glycol
  • Banzoic acid
  • Oxalic acid
Which acid is used in medicine for the treatment of gout?
  • Hydrochloric acid
  • Methanoic acid
  • Ethanoic acid
  • None of these
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 is correct?
  • Formic acid is used in medicine for the treatment of gout
  • Propanoic acid is used as an antiseptic in the preservation of fruit juice
  • Ethanoic acid is a coagulating agent in rubber industry
  • None of these
Which acid is used in rubber industry as a coagulating agent?
  • Methanoic acid
  • Ethanoic acid
  • Propanoic acid
  • Butanoic 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 acid is used as table vinegar?
  • Formic acid
  • Acetic acid
  • Picric acid
  • None of these
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
The product C is:
1089498_79a162dbf76c4edd9a5fc7a0b02622d5.png

Select the best way for reducing the $$C=O$$ group in each of the following:
1093553_78a36f87aa9a4bc1b96cf52ce70beb42.png
Which of the following set of reaction can not prepare $$R-\overset{O}{\overset{||}{C}}-OH$$ as the final product?
  • $$R-MgX + O = C = O \xrightarrow{dry. ether} A \xrightarrow{H_3O^+}$$
  • $$R-CN \xrightarrow[(ii) \, H_2O / H^+]{SnCl_2+HCl}$$
  • $$CH_3(CH_2)_8CH_2OH \xrightarrow[H_2SO_4]{CrO_3}$$
 The Compound E is:
1116424_4d8de423eeef4bf7adfa984faf8c6887.png
Which of the following molecules contain more enol content at equilibrium?
  • $$OHC - CH_2 - CHO$$
  • $$CH_3COCH_2COOCH_3$$
  • $$CH_2(COOH)_2$$
  • $$CH_3COCH_3$$
When o-xylene is oxidised with alkaline $$KMnO_4$$, the product is:
  • Terephthalic acid
  • Phthalic acid
  • Benzoic acid
  •  Salicylic acid
The acidity of alpha hydrogen of the carbonyl group is due to:
  • The aldehydes and ketones undergo a number of reactions due to the acidic nature of $$\alpha-hydrogen$$.
  • The acidity of $$\alpha-hydrogen$$ atoms of carbonyl compounds is due to the strong electron withdrawing effect of the carbonyl group and resonance stabilization of the conjugate base.
  • both A and B 
  • none of these
Which of the following is nucleophilic addition reaction?
  • $$CH_3COCl \xrightarrow {CH_3MgBr\ (1 eq.)} CH_3COCH_3$$
  • $$CH_3COCH_3 \xrightarrow{I_2/OH^-/\triangle} CH_3COO^-+CHI_3$$
  • $$PhCHO \xrightarrow{KCN/H^{\oplus}} PhCH(OH)(CN)$$
  • $$CH_3C \equiv CMgBr \xrightarrow{CH_3Br}CH_3C\equiv CCH_3$$
The compound $$(S)$$ is:

76801.png
The compound (X) is:
  • $$PhCOONa$$
  • $$Ph - CH = CH - Ph$$
What will be the product of the following reaction :
 (according to OPTIONS in the image shown)

116628.jpg
  • B
  • C
  • D
  • A
Identify $$X$$ in the following reaction.

77017.jpg
A carbonyl compound '$$A$$' reacts with hydrogen cyanide to form a cyanohydrin '$$B$$' which on hydrolysis gives an optically active alpha-hydroxy acid '$$C$$'. '$$C$$' also gives a positive iodoform test.
'$$A$$', '$$B$$' and '$$C$$' is given by the set:-
  • $$HCHO$$;
  • $$CH_{3}CHO$$;
  • $$CH_{3}CH_{2}CHO$$
Which of the following is most reactive to give nucleophilic addition ? 
  • FCH$$_2$$CHO
  • ClCH$$_2$$CHO
  • BrCH$$_2$$CHO
  • ICH$$_2$$CHO
R and S are:
330536_6946fe6fbcc24d18934f42886f457649.png
  • I only
  • I and II
  • III only
  • None of these
  • Blank
Compound $$(C)\;\xrightarrow{P_4O_{10}}\;Product\;(F)$$

The product $$F$$ may be:
  • Malonic anhydride
  • Ethanoic anhydride
  • Ethanal
  • A lactone

The number of $$sp^2$$ hybridized carbon atoms in the given compound is:
631162_3f6f7acdb5b3462a9764b31af67c5496.png
  • 3
  • 4
  • 5
  • 6
The final product $$(Y)$$ in the following sequence of chemical reaction is:
$$CH_3OH\xrightarrow[300^oC]{Cu} X \xrightarrow{NaOH} Y + CH_3OH$$
  • an alkene
  • a carboxylic acid
  • an aldehyde
  • sodium salt of carboxylic acid
When a nucleophile 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 as ketones do not react with nucleophiles
Identify $$(X),\ (Y)$$ and $$(Z)$$ in the given reaction.
$$CH_3CHO \xrightarrow[H_2SO_4]{K_2Cr_2O_7}(X) \xrightarrow{PCl_5}(Y) \xrightarrow[anh.AlCl_3]{C_6H_6}(Z)$$ :
  • $$(X) = HCOOH,\,\,\, (Y) = COCl_2, \,\,\, (Z) = C_6H_5Cl$$
  • $$(X) = CH_3COOH,\,\,\, (Y) = CH_3COCl, \,\,\, (Z) = C_6H_5COCH_3$$
  • $$(X) = CH_3COOH,\,\,\, (Y) = CH_3CH_2CH_2Cl, \,\,\, (Z) = C_6H_5CH_2CH_2CH_3$$
  • $$(X) = CH_3COCH_3,\,\,\, (Y) = CH_3CH(Cl)CH_3, \,\,\, (Z) = C_6H_5COCH_3$$
The correct order of $$pK_a$$ for the following acid:

Oxalic acid                  $$pK_1$$
Monalic acid               $$pK_2$$
Heptanedioic acid       $$pK_3$$

where $$pK_1$$, $$pK_2$$, $$pK_3$$ are first ionization constants.
  • $$pK_1$$ > $$pK_2$$ > $$pK_3$$
  • $$pK_1$$ < $$pK_2$$ < $$pK_3$$
  • $$pK_3$$ > $$pK_2$$ = $$pK_1$$
  • $$pK_3$$ > $$pK_1$$ > $$pK_2$$
Identify $$(X)$$ and $$(Y)$$ in the given reaction sequence. 
938093_221910029614448aabf945a88641dc97.png
Which of the following compounds is most reactive towards nucleophilic addition reactions?
  • $$CH_3-{\overset{O}{\overset{||}{C}}}-CH_3$$
  • $$CH_3-{\overset{O}{\overset{||}{C}}}-H$$
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