CBSE Questions for Class 12 Medical Chemistry Aldehydes, Ketones And Carboxylic Acids Quiz 8 - MCQExams.com

The rose odour from an ester is formed by the action of $$HCOOH$$ on
  • Pine oil
  • Olive oil
  • Geraniol
  • Turpentine oil
Reaction of primary amines with aldehyde yields
  • amides
  • aldimines
  • nitriles
  • nitro compounds
Among the following acids which has the lowest $$pKa$$ value
  • $$CH_3COOH$$
  • $$HCOOH$$
  • $$(CH_3)_2CH-COOH$$
  • $$CH_3CH_2COOH$$
Carbonyl compounds are usually 
  • Ethers , aldehydes , ketones and carboxylic acids
  • Aldehydes , ketones and carboxylic acids
  • Aldehydes and ketones
  • Carboxylic acids
Oleic, stearic and palmitic acids are
  • Fatty acid
  • Amino acid
  • Nucleic acid
  • Essential acid
Compounds $$(A)$$ and $$(B)$$ are:
1768336_3632c7e8f9144a0b85c1d432037bbfb8.png
$$2 , 4 - \text{dichloro phenoxyacetic}$$ acid is used as a
  • Fungicide
  • Insecticide
  • Herbicide
  • Moth repellent
The order of susceptibility of nucleophilic attack on aldehydes follows the order 
  • $$ 1^{\circ} > 3^{\circ} > 2^{\circ} $$
  • $$ 1^{\circ} > 2^{\circ} > 3^{\circ} $$
  • $$ 3^{\circ} > 2^{\circ} > 1^{\circ} $$
  • $$ 2^{\circ} > 3^{\circ} > 1^{\circ} $$
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 
  • $$ sp^2d $$
  • $$ sp^3 $$
  • $$ sp^2 $$
  • $$sp$$
Which of the following compounds would have the smallest value for $$ pK_{a} $$ ?
  • $$ CHF_{2}CH_{2}CH_{2}COOH$$
  • $$ CH_{3}CH_{2}CF_{2}COOH$$
  • $$ CH_{2}FCHFCH_{2}COOH $$
  • $$ CH_{3}CF_{2}CH_{2}COOH$$
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 .
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
Diacetone alcohol is also known as ___________.
  • $$4$$-hydroxy butyraldehyde
  • $$4$$-Hydroxy-$$4$$-methyl-$$2$$-pentanone
  • but-$$2$$-en-$$1$$-al
  • butan-$$2,\:4$$-dione
What is the compound $$A$$?
29498.png
  • Oxalic acid
  • Malonic acid
  • Succinic acid
  • Adipic acid
Rochelle salt is :
  • sodium tartarate
  • sodium potassium tartarate
  • ammonium tartarate
  • potassium ammonium tartarate
The enol form of acetone, after treatment with $$ D_{2} O$$ gives :
Which of the following cannot form $$CH_{3}COOH$$ from $$C_{2}H_{5}OH$$?
A) PCC
B) PDC
C) $$K_{2}Cr_{2}O_{7} / H^{+}$$
D)$$KMnO4/ H^+$$
  • A and B only
  • C and D only
  • Only A
  • All A, B, C and D
One mole of an organic compound requires 0.5 moles of oxygen to produce a carboxylic acid. The compound may be :
  • alcohol
  • ether
  • ketone
  • aldehyde
List-A
List-B
Aldehyde
Oxidised product of
Aldehyde
Formaldehyde
A. Acetic Acid
Acetaldehyde
B. Propanoic acid
Propionaldehyde
C. Isobutyric acid
Isobutyraldehyde
D. Methanoic acid

Match the contents in List-A to that in List-B.
  • 1-D, 2-A, 3-B, 4-C
  • 1-A, 2-D, 3-C, 4-B
  • 1-A, 2-C, 3-D, 4-B
  • 1-D, 2-B, 3-C, 4-A
Among the given compounds, the compound which is most susceptible to a nucleophilic attack at the carbonyl group is :
  • $$CH_{3}COCl$$
  • $$CH_{3}CHO$$
  • $$CH_{3}COOCH_{3}$$
  • $$CH_{3}COOCOCH_{3}$$

The major product obtained in the reaction is :

29770_5ea5da6dd7944e839872425b38fa2896.png

From above reaction, the formation of product is:

30812.bmp
  • HCOOH
Statement- I: Carbonyl compounds take part in nucleophilic addition reactions.
Statement- II: These reactions are initiated by nucelophilic attack at the electron deficient carbon atom.
  • Both the statements are true and statement-II is the correct explanation of
    statement-I.
  • Both statements are true but statement-II is not the correct explanation of
    statement-I.
  • Statement-I is true but statement-II is false
  • Statement-I is false but statement-II is true.
P -cresol reacts with chloroform in an alkaline medium to give the compound A which adds hydrogen cyanide to form, the compound B. The latter on acidic hydrolysis gives chiral carboxylic acid. The structure of the carboxylic acid is:
An organic compound $$A$$ with molecular formula $$C_{6}H_{6}$$ on treating with $$CH_{3}Cl$$ in presence of anhydrous $$AlCl_{3}$$ gives $$B$$. $$B$$ on treating with nitration mixture gives $$C$$. Compound $$C$$ on reacting with $$K_{2}Cr_{2}O_{7}/H_{2}SO_{4}$$ gives D. Then the compound $$D$$ is :

In the above sequence of reactions, final product $$D$$ is :
30815_1643fdc148d645e2971f9d659d3bf7b1.png
How many moles of ammonia will react with three moles of benzaldehyde to form osazone?
  • 2 moles of ammonia
  • 1 mole of ammonia
  • 3 moles of ammonia
  • 4 moles of ammonia
The compound $$2-$$ methy$$-2-$$butene on reaction with $$NaIO_{4}$$ in the presence of $$KMnO_{4}$$ gives :

29780_cd6cfcd776cc48bcabf89f2fcb926e55.png
  • $$CH_{3}COOH$$
  • $$CH_{3}COCH_{3}+CH_{3}COOH$$
  • $$CH_{3}COCH_{3}+CH_{3}CHO$$
  • $$CH_{3}CHO+CO_{2}$$
On vigorous oxidation by permanganate solution, $$(CH_{3})_{2} C = CH - CH_{2} - CHO$$ gives___________.
  • $$CH_3-\!\!\!\underset{CH_3}{\underset{|}{\overset{\,\,\,\,CH_3}{\overset{|}{C}}}-}\overset{OH}{\overset{|}{C}H}-CH_2CH_3$$
  • $$(CH_{3})_{2}COOH$$, $$CH_{2}(COOH)_{2}$$
Which of the following, on oxidation will not give a carboxylic acid with the same number of carbon atoms?
  • $$CH_{3}COCH_{3}$$
  • $$CCl_{3}CH_{2}CHO$$
  • $$CH_{3}CH_{2}CH_{2}OH$$
  • $$CH_{3}CH_{2}CHO$$
In the above sequence of reactons D is :
31536_0495830f45964402830e1d46d63a55e6.png
The correct product of the following sequence of reactions is:

$$(CH_{3})_{2} CHCOOH\xrightarrow[(iiH_{2}O)]{(i)LiAH}\xrightarrow[]{PBr_{3}}\xrightarrow[DMSO]{KCN}\xrightarrow[\Delta]{H_{2}O,H^{+}}$$?
  • $$(CH_{3})_{2}CHCHBrCOOH$$
  • $$(CH_{3})_{2}CHCH_{2}COOH$$
  • $$(CH_{3})_{2}CHCH_{2}CH_{2}NH_{2}$$
  • $$(CH_{3})_{2}C = CHCOOH$$
Which one of the following undergoes reaction with $$50\%$$ sodium hydroxide solution to give the  corresponding alcohol and acid?
  • Phenol
  • Benzaldehyde
  • Butanal
  • Benzoic acid
Among the given compounds, the most susceptible to nucleophilic attack at the carbonyl group is:
  • $$CH_{3}COOCH_{3}$$
  • $$CH_{3}CONH_{2}$$
  • $$CH_{3}COOCOCH_{3}$$
  • $$CH_{3}COCl$$
Butyraldehyde are produced commercially by:
  • hydroformylation
  • hydroacetylation
  • formylation
  • acetylation
Which of the following halides cannot be used in Wittg reaction?
  • $$(CH_{3})_{3}CCl$$
  • $$CH_{2}=CHCl$$
In the above sequence of reactions, $$E$$ is :
31538_27a647447dee4e79b5d6ea8c61cb2d28.png
In the following sequence, products $$I, J$$ and $$L$$ are formed. $$K$$ represents a reagent. The structures of compounds $$J$$ and $$K$$ respectively are:
32308_f6a5ec74f65343eda32f304bdceef397.PNG
The compound formed as a result of oxidation of ethyl benzene by KMnO$$_{4}$$ is:
  • benzophenone
  • acetophenone
  • benzoic acid
  • benzyl alcohol
Which of the following acids are unsaturated one :
  • Stearic acid
  • Acrylic acid
  • Oleic acid
  • Crotonic acid
Cyclohexene is best prepared from cyclohexanol by which of the following: 
  • conc. $$\mathrm{H}_{3}\mathrm{P}\mathrm{O}_{4}$$
  • conc. $$\mathrm{H}\mathrm{C}l/\mathrm{Z}\mathrm{n}\mathrm{C}1_{2}$$
  • conc. HCl
  • conc. HBr
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
Observe the following reaction. the product P shows positive test towards neutral $$FeCl_{3}$$ , Q towards $$I_{2}/O^{\circleddash }H$$ and R towards fehling solution.
$$M\xrightarrow{DBr(Anhydrous)/ 1\ eq.}$$ Product is :

73070_9782374f86aa4bdd9ccb480349fc5005.png
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