The correct order of decreasing acidity of the following aliphatic acids is :
Organic Compounds Containing Oxygen
Every question from past board papers on Organic Compounds Containing Oxygen, newest paper first. Open any question for its full worked answer.
NEET UG 2025 question paper (official, booklet 45)
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The major product of the following reaction is :
Reactant: Ph-CO-CH2CH2-CN; (i) \(\mathrm{CH_3MgBr}\) (excess); (ii) \(\mathrm{H_3O^+}\)
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Identify the suitable reagent for the following conversion.
Methyl benzoate (Ph-COOCH3) \(\to\) benzaldehyde (Ph-CHO)
NEET UG 2024 question paper (official, booklet S6)
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Identify the correct reagents that would bring about the following transformation.
[structure transformation shown in figure: ring-CH\(_2\)-CH=CH\(_2\) \(\rightarrow\) ring-CH\(_2\)-CH\(_2\)-CHO]
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Match List I with List II.
List I (Reactions): A. [structure: bicyclohexylidene \(\rightarrow\) 2 cyclohexanone] B. [structure: benzene \(\rightarrow\) benzophenone] C. [structure: cyclohexanol \(\rightarrow\) cyclohexanone] D. [structure: ethylbenzene \(\rightarrow\) potassium benzoate]
List II (Reagents/Condition): I. benzoyl chloride / Anhyd. \(AlCl_3\) II. \(CrO_3\) III. \(KMnO_4\)/KOH, \(\Delta\) IV. (i) \(O_3\) (ii) \(Zn\)-\(H_2O\)
Choose the correct answer from the options given below:
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Which one of the following alcohols reacts instantaneously with Lucas reagent?
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Major products A and B formed in the following reaction sequence, are
[scheme: 2-methylcyclohexanol (OH and \(H_3C\) on adjacent ring carbons) \(\xrightarrow{PBr_3}\) A (major) \(\xrightarrow[\Delta]{alc.\ KOH}\) B (major), see figure]
NEET UG 2023 question paper (official, booklet G6)
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Complete the following reaction :
cyclohexanone [A] \(\xrightarrow{HCN}\) cyclohexanone cyanohydrin (1-hydroxycyclohexanecarbonitrile) [B] \(\xrightarrow[\Delta]{conc.\ H_2SO_4}\) [C]
[C] is ________.
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Identify product (A) in the following reaction :
3-(3-acetylphenyl)-substituted cyclohexyl methyl ketone: a cyclohexane ring bearing an acetyl group, joined to a benzene ring bearing an acetyl group (meta), \(\xrightarrow[\text{conc. HCl}]{\text{Zn-Hg}}\) (A) + 2H\(_2\)O
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Consider the following reaction and identify the product (P).
\(\mathrm{CH_3-CH(CH_3)-CH(OH)-CH_3}\) (3 - Methylbutan-2-ol) \(\xrightarrow{HBr}\) Product (P)
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Consider the following reaction :
\(\mathrm{C_6H_5-CH_2-O-C_6H_5 \xrightarrow[\Delta]{HI} A + B}\) (benzyl phenyl ether)
Identify products A and B.
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Which amongst the following will be most readily dehydrated under acidic conditions ?
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Identify the major product obtained in the following reaction :
2-acetylbenzaldehyde (benzene ring with ortho -COCH\(_3\) and -CHO) + 2\([\mathrm{Ag(NH_3)_2}]^+\) + 3 \(^-\)OH \(\xrightarrow{\Delta}\) major product
NEET UG 2022 question paper (official, booklet R6)
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\(RMgX + CO_2 \xrightarrow{\text{dry ether}} Y \xrightarrow{H_3O^+} RCOOH\)
What is Y in the above reaction ?
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Given below are two statements :
Statement I :
The acidic strength of monosubstituted nitrophenol is higher than phenol because of electron withdrawing nitro group.
Statement II :
\(o\)-nitrophenol, \(m\)-nitrophenol and \(p\)-nitrophenol will have same acidic strength as they have one nitro group attached to the phenolic ring.
In the light of the above statements, choose the most appropriate answer from the options given below :
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Match List - I with List - II.
List - I (Products formed): (a) Cyanohydrin (b) Acetal (c) Schiff's base (d) Oxime
List - II (Reaction of carbonyl compound with): (i) \(NH_2OH\) (ii) \(RNH_2\) (iii) alcohol (iv) HCN
Choose the correct answer from the options given below :
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Given below are two statements :
Statement I :
The boiling points of aldehydes and ketones are higher than hydrocarbons of comparable molecular masses because of weak molecular association in aldehydes and ketones due to dipole - dipole interactions.
Statement II :
The boiling points of aldehydes and ketones are lower than the alcohols of similar molecular masses due to the absence of H-bonding.
In the light of the above statements, choose the most appropriate answer from the options given below :
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Given below are two statements :
Statement I :
In Lucas test, primary, secondary and tertiary alcohols are distinguished on the basis of their reactivity with conc. HCl + \(ZnCl_2\), known as Lucas Reagent.
Statement II :
Primary alcohols are most reactive and immediately produce turbidity at room temperature on reaction with Lucas Reagent.
In the light of the above statements, choose the most appropriate answer from the options given below :
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Which one of the following is not formed when acetone reacts with 2-pentanone in the presence of dilute NaOH followed by heating ?
NEET UG 2021 question paper (official, booklet M4)
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What is the IUPAC name of the organic compound formed in the following chemical reaction ?
Acetone \(\xrightarrow[\text{(ii) } H_2O, H^+]{\text{(i) } C_2H_5MgBr,\ \text{dry Ether}}\) Product
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The product formed in the following chemical reaction is :
2-(methyl-substituted) cyclohexanone bearing \(CH_2-C(=O)-OCH_3\) and \(CH_3\) groups \(\xrightarrow[C_2H_5OH]{NaBH_4}\) ?
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Match List - I with List - II.
List - I : (a) benzene \(\xrightarrow[\text{Anhyd. }AlCl_3/CuCl]{CO,\ HCl}\) (b) \(R-CO-CH_3 + NaOX \rightarrow\) (c) \(R-CH_2-OH + R'COOH \xrightarrow{\text{Conc. }H_2SO_4}\) (d) \(R-CH_2COOH \xrightarrow[\text{(ii) }H_2O]{\text{(i) }X_2/\text{Red P}}\)
List - II : (i) Hell-Volhard-Zelinsky reaction (ii) Gattermann-Koch reaction (iii) Haloform reaction (iv) Esterification
Choose the correct answer from the options given below.
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The intermediate compound 'X' in the following chemical reaction is :
toluene \(+ CrO_2Cl_2 \xrightarrow{CS_2} X \xrightarrow{H_3O^+}\) benzaldehyde
NEET UG 2020 question paper (official, booklet E1)
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Reaction between acetone and methylmagnesium chloride followed by hydrolysis will give :
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Reaction between benzaldehyde and acetophenone in presence of dilute NaOH is known as :
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Anisole on cleavage with HI gives :
NEET UG 2019 question paper (official, booklet P1)
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The structure of intermediate A in the following reaction, is :
[Reaction: cumene (isopropylbenzene) \(\xrightarrow{O_2}\) A \(\xrightarrow[H_2O]{H^+}\) phenol + acetone]
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The compound that is most difficult to protonate is :
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The major product of the following reaction is :
phthalic acid (benzene-1,2-dicarboxylic acid) + NH\(_3\) \(\xrightarrow{strong\ heating}\)
NEET UG 2018 question paper (official, booklet EE)
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A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. H\(_2\)SO\(_4\). The evolved gaseous mixture is passed through KOH pellets. Weight (in g) of the remaining product at STP will be
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In the reaction
[phenol + CHCl\(_3\) + NaOH \(\rightarrow\) sodium salicylaldehyde (o-O\(^-\)Na\(^+\) C\(_6\)H\(_4\) CHO), shown as a structure]
the electrophile involved is
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Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their
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Compound A, C\(_8\)H\(_{10}\)O, is found to react with NaOI (produced by reacting Y with NaOH) and yields a yellow precipitate with characteristic smell.
A and Y are respectively
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The compound A on treatment with Na gives B, and with PCl\(_5\) gives C. B and C react together to give diethyl ether. A, B and C are in the order
NEET UG 2017 question paper (official, booklet B)
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Mixture of chloroxylenol and terpineol acts as :
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The heating of phenyl-methyl ethers with HI produces.
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Which one is the most acidic compound ?
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Of the following, which is the product formed when cyclohexanone undergoes aldol condensation followed by heating ?
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Consider the reactions :
\(X\ (C_2H_6O) \xrightarrow{Cu/573\ K} A \xrightarrow{[Ag(NH_3)_2]^+,\ ^-OH,\Delta}\) Silver mirror observed; \(A \xrightarrow{^-OH,\Delta} Y\); \(A \xrightarrow{NH_2-NH-C(=O)-NH_2} Z\)
Identify A, X, Y and Z
NEET UG 2016 Phase 1 question paper (official, booklet A)
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The correct statement regarding a carbonyl compound with a hydrogen atom on its alpha-carbon, is :
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Which of the following reagents would distinguish cis-cyclopenta-1, 2-diol from the trans-isomer ?
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The reaction
[cyclopentanol, then NaH giving sodium cyclopentoxide, then Me-I giving methyl cyclopentyl ether; scheme shown in figure]
can be classified as :
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The product formed by the reaction of an aldehyde with a primary amine is :
NEET UG 2016 Phase 2 question paper (official, booklet ZZ)
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The correct structure of the product \(A\) formed in the reaction [cyclohex-2-enone, \(H_2\) (gas, 1 atmosphere), Pd/carbon, ethanol \(\rightarrow A\)] is
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The correct order of strengths of the carboxylic acids [I, II, III shown] is
