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All questions of Aldehydes, Ketones and Carboxylic Acids (OC) for MCAT Exam
CH3CHO and C6H5CH2CHO can be distinguished chemically by:- a)Benedict test
- b)Iodoform test
- c)Tollen's reagent test
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
CH3CHO and C6H5CH2CHO can be distinguished chemically by:
a)
Benedict test
b)
Iodoform test
c)
Tollen's reagent test
d)
None of these
|
Samridhi Bajaj answered |
CH3CHO will give iodoform test and C6H5CH2CHO will not give iodoform test.
The oxidation of toluene to benzoic acid can be stopped at the aldehyde stage. The reaction is called?- a)Etard reaction
- b)Stephen reaction
- c)Friedel – crafts reaction
- d)Gatterman – Koch reaction
Correct answer is option 'A'. Can you explain this answer?
The oxidation of toluene to benzoic acid can be stopped at the aldehyde stage. The reaction is called?
a)
Etard reaction
b)
Stephen reaction
c)
Friedel – crafts reaction
d)
Gatterman – Koch reaction
|
Indu Indu answered |
Red algae .it is also responsible for red colour water in mediterreian sea
In the propanoate ion- a)both the carbon – oxygen bonds are the same length.
- b)the carbon atom bears a – 1 charge.
- c)one of the oxygen atoms bears a – 1 charge
- d)the carbon – oxygen double bond is shorter.
Correct answer is option 'A'. Can you explain this answer?
In the propanoate ion
a)
both the carbon – oxygen bonds are the same length.
b)
the carbon atom bears a – 1 charge.
c)
one of the oxygen atoms bears a – 1 charge
d)
the carbon – oxygen double bond is shorter.
|
Vivek Rana answered |
This is because of Resonance.
Arrange the following compounds in decreasing order of their acid strength: i) trichloroacetic acid ii) trifluoroacetic acid iii) acetic acid and iv) formic acid- a)trifluoroacetic acid, trichloroacetic acid, formic acid and acetic acid
- b)formic acid., trifluoroacetic acid, trichloroacetic acid, and acetic acid
- c)trichloroacetic acid, trifluoroacetic acid, acetic acid and formic acid.
- d)trifluoroacetic acid, formic acid acetic acid and Propan – 1 – ol, 4 – methylphenol
Correct answer is option 'A'. Can you explain this answer?
Arrange the following compounds in decreasing order of their acid strength: i) trichloroacetic acid ii) trifluoroacetic acid iii) acetic acid and iv) formic acid
a)
trifluoroacetic acid, trichloroacetic acid, formic acid and acetic acid
b)
formic acid., trifluoroacetic acid, trichloroacetic acid, and acetic acid
c)
trichloroacetic acid, trifluoroacetic acid, acetic acid and formic acid.
d)
trifluoroacetic acid, formic acid acetic acid and Propan – 1 – ol, 4 – methylphenol
|
Tanuja Kapoor answered |
Acidic strength of carboxylic acid -
– More acidic than phenols or alcohols.
– Acidity increase with the presence of a group with -I effect in the alkyl group.Whereas it decreases with the presence of +I group.
– Acidity increases with increase in the number of halogen atoms on 
- position.
- position.– It decreases with increasing distance of halogen from 
– It increases with increase in the electronegativity of halogen.
- CF3COOH > CCl3COOH > HCOOH > CH3 COOH
A strong base can abstract an α – hydrogen from- a)Alkane.
- b)Amine
- c)Ketone
- d)Alkene
Correct answer is option 'C'. Can you explain this answer?
A strong base can abstract an α – hydrogen from
a)
Alkane.
b)
Amine
c)
Ketone
d)
Alkene
|
|
Vijay Bansal answered |
After deprotonation the negative charge will be in conjugation with the pi orbital of carbonyl..so base will prefer to abstract alpha hydrogen from ketone.
What compound is produced when cyclohexene is treated with concentrated KMnO4?- a)adipic acid
- b)succinic acid
- c)hexanoic acid
- d)cyclohexanecarboxylic acid
Correct answer is option 'A'. Can you explain this answer?
What compound is produced when cyclohexene is treated with concentrated KMnO4?
a)
adipic acid
b)
succinic acid
c)
hexanoic acid
d)
cyclohexanecarboxylic acid
|
Dishani Kulkarni answered |
Conc KMnO4 will cause oxidation and ring opening forming adipic acid.
The common name for pentanedioic acid is:- a)succinic acid
- b)oxalic acid
- c)glutaric acid
- d)pimelic acid
Correct answer is option 'C'. Can you explain this answer?
The common name for pentanedioic acid is:
a)
succinic acid
b)
oxalic acid
c)
glutaric acid
d)
pimelic acid
|
Aryan Sen answered |
Pentanedioic acid is glutaric acid.
The compound obtained when acetaldehyde reacts with dilute aqueous sodium hydroxide exhibits:- a)geometrical isomerism
- b)both optical and geometrical isomerism
- c)optical isomerism.
- d)neither optical nor geometrical isomerism
Correct answer is option 'A'. Can you explain this answer?
The compound obtained when acetaldehyde reacts with dilute aqueous sodium hydroxide exhibits:
a)
geometrical isomerism
b)
both optical and geometrical isomerism
c)
optical isomerism.
d)
neither optical nor geometrical isomerism
|
Amrutha Pillai answered |
CH3CH=CHCHO is the product which is suitably substituted so will show geometrical isomer.
Which of the following is correct?
- a)On reduction any aldehyde gives secondary alcohol
- b)Reaction of vegetable oil with H2SO4 gives glycerine
- c)Alcoholic iodine with NaOH gives iodoform
- d)Sucrose on reaction with NaCl gives invert sugar
Correct answer is option 'C'. Can you explain this answer?
Which of the following is correct?
a)
On reduction any aldehyde gives secondary alcohol
b)
Reaction of vegetable oil with H2SO4 gives glycerine
c)
Alcoholic iodine with NaOH gives iodoform
d)
Sucrose on reaction with NaCl gives invert sugar
|
Pooja Pillai answered |
Many naturally occurring aldehydes and ketones are used in the blending of perfumes and flavouring agents. But the preferred ones are- a)higher ketones
- b)lower aldehydes
- c)lower ketones
- d)higher aldehydes
Correct answer is option 'D'. Can you explain this answer?
Many naturally occurring aldehydes and ketones are used in the blending of perfumes and flavouring agents. But the preferred ones are
a)
higher ketones
b)
lower aldehydes
c)
lower ketones
d)
higher aldehydes
|
Pritam Malik answered |
Higher aldehydes are preferred.
The oxidation of toluene to benzoic acid can be stopped at the aldehyde stage, to give benzadehyde, The reagent used for the purpose is one of the following.- a)Chromyl chloride
- b)Carbon monoxide and hydrogen chloride
- c)Chlorine
- d)Chromic oxide
Correct answer is option 'A'. Can you explain this answer?
The oxidation of toluene to benzoic acid can be stopped at the aldehyde stage, to give benzadehyde, The reagent used for the purpose is one of the following.
a)
Chromyl chloride
b)
Carbon monoxide and hydrogen chloride
c)
Chlorine
d)
Chromic oxide
|
Preethi Bose answered |
This is Etard Reaction.
Aldehydes are produced on reduction of the following by DIBAL – H- a)esters
- b)nitriles
- c)both nitriles and esters
- d)none of these
Correct answer is option 'C'. Can you explain this answer?
Aldehydes are produced on reduction of the following by DIBAL – H
a)
esters
b)
nitriles
c)
both nitriles and esters
d)
none of these
|
Avi Chawla answered |
Both Nitriles and esters are reduced to Aldehyde on reaction with DIBAL-H.
In Hell – Volhard Zelinsky reaction, halogen reacts with- a)ketones
- b)carboxylic acids
- c)ethers
- d)aldehydes
Correct answer is option 'B'. Can you explain this answer?
In Hell – Volhard Zelinsky reaction, halogen reacts with
a)
ketones
b)
carboxylic acids
c)
ethers
d)
aldehydes
|
Ashwini Chakraborty answered |
Alpha Hydrogen containing carboxylic acids undergo HVZ reaction.
Arrange the following alcohols, hydrocarbon and ether in order of their increasing boiling points Pentan – 1 – ol, n – butane, pentanal, ethoxyethane.- a)n – Butane, ethoxyethane, pentanal and pentan – 1 – ol.
- b)pentanal and pentan – 1 – ol, n – Butane, ethoxyethane
- c)ethoxyethane, pentanal and pentan – 1 – ol, n – Butane
- d)pentan – 1 – ol , n – Butane, ethoxyethane, pentanal
Correct answer is option 'A'. Can you explain this answer?
Arrange the following alcohols, hydrocarbon and ether in order of their increasing boiling points Pentan – 1 – ol, n – butane, pentanal, ethoxyethane.
a)
n – Butane, ethoxyethane, pentanal and pentan – 1 – ol.
b)
pentanal and pentan – 1 – ol, n – Butane, ethoxyethane
c)
ethoxyethane, pentanal and pentan – 1 – ol, n – Butane
d)
pentan – 1 – ol , n – Butane, ethoxyethane, pentanal
|
Rahul Desai answered |
Alcohols have higher boiling points than aldehydes.
The reagents to bring about the change from but – 2 – ene to ethanal - a)PCC
- b)
- c)DIBAL – H
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
The reagents to bring about the change from but – 2 – ene to ethanal
a)
PCC
b)
c)
DIBAL – H
d)
None of these
|
Aditya Sen answered |
Reductive Ozonolysis of alkene forms aldehyde or ketone.
The appropriate reagent for the transformation:
- a)NaBH4
- b)NH2NH2, OH-
- c)Zn(Hg), HCl
- d)H2, Ni
Correct answer is option 'B'. Can you explain this answer?
The appropriate reagent for the transformation:
a)
NaBH4
b)
NH2NH2, OH-
c)
Zn(Hg), HCl
d)
H2, Ni
|
Rajesh Chatterjee answered |
In this reaction, a CO group is converted to CH2 group.
This can be achieved by Wolff-Kishner reduction which uses reagent NH2NH2, OH− (hydrazine in alkaline medium).
Clemmensen reduction (Zn(Hg)/HCl) cannot be used as in presence of HCl, the alcohol may undergo dehydration.
Which of the following acids does not exhibit optical isomerism?- a)Maleic acid
- b)α – amino acids
- c)Lactic acid
- d)Tartaric acid
Correct answer is option 'A'. Can you explain this answer?
Which of the following acids does not exhibit optical isomerism?
a)
Maleic acid
b)
α – amino acids
c)
Lactic acid
d)
Tartaric acid
|
Rohan Chakraborty answered |
Maleic Acid shows Geometrical Isomerism but does not give optical isomerism.
Chapter doubts & questions for Aldehydes, Ketones and Carboxylic Acids (OC) - MCAT Chemical and Physical Foundations 2025 is part of MCAT exam preparation. The chapters have been prepared according to the MCAT exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for MCAT 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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