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Aldehydes, Ketones and Carboxylic Acids Test 3

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Aldehydes, Ketones and Carboxylic Acids Test 3
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Give the name of the following compound:

    Solution

    The correct answer is option D(None of the above)
    The given compound is 4-Bromo-3methylheptanal

  • Question 2
    1 / -0

    Arrange the following alcohols, hydrocarbon and ether in order of their increasing boiling points Pentan – 1 – ol, n – butane, pentanal, ethoxyethane.

    Solution

    Alcohols have higher boiling points than aldehydes.

  • Question 3
    1 / -0

    The compound formed as a result of oxidation of ethyl benzene by KMnO4 is

    Solution

  • Question 4
    1 / -0

    Give IUPAC names of the following compound:

    Solution

    This is 1-phenyl propan-1-one.

  • Question 5
    1 / -0

    The reagents to bring about the change from but – 2 – ene to ethanal  

    Solution

    Reductive Ozonolysis of alkene forms aldehyde or ketone.

  • Question 6
    1 / -0

    Which of the following is correct?

    Solution

    C2H5OH get oxidizes to CH3CHO and –COCH3 group is important for iodoform.

  • Question 7
    1 / -0

    A strong base can abstract an α – hydrogen from

    Solution

    Because conjugate base that form will be stable in case of Ketone.

  • Question 8
    1 / -0

    Which of the following reagents can be used to convert a carboxylic acid directly into its corresponding acid chloride derivative?

    Solution

  • Question 9
    1 / -0

    The appropriate reagent for the transformation:

    Solution

    In this reaction, a CO group is converted to CH2​ group.

    This can be achieved by Wolff-Kishner reduction which uses reagent NH2​NH2​, OH− (hydrazine in alkaline medium).


    Clemmensen reduction (Zn(Hg)/HCl) cannot be used as in presence of HCl, the alcohol may undergo dehydration.

  • Question 10
    1 / -0

    What compound is produced when cyclohexene is treated with concentrated KMnO4?

    Solution

    Conc KMnO4 will cause oxidation and ring opening forming adipic acid.

  • Question 11
    1 / -0

    Arrange the following compounds in decreasing order of their acid strength: i) trichloroacetic acid ii) trifluoroacetic acid iii) acetic acid and iv) formic acid

    Solution

    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.

    –  It decreases with increasing distance of halogen from   

    –  It increases with increase in the electronegativity of halogen.

    - CF3COOH > CCl3COOH > HCOOH > CH3 COOH

  • Question 12
    1 / -0

    The combination of a carbonyl group and a hydroxyl group on the same carbon atom is called a __________ group.

    Solution

    -COOH is carboxyl group.

  • Question 13
    1 / -0

    CH3CHO and C6H5CH2CHO can be distinguished chemically by:

    Solution

    CH3CHO will give iodoform test and C6H5CH2CHO will not give iodoform test.

  • Question 14
    1 / -0

    The common name for pentanedioic acid is:

    Solution

    Pentanedioic acid is glutaric acid.

  • Question 15
    1 / -0

    Which of the following acids does not exhibit optical isomerism?

    Solution

    Maleic Acid shows Geometrical Isomerism but does not give optical isomerism.

  • Question 16
    1 / -0

    In the propanoate ion

    Solution

    This is because of Resonance.

  • Question 17
    1 / -0

    Aldehydes are produced on reduction of the following by DIBAL – H

    Solution

    Both Nitriles and esters are reduced to Aldehyde on reaction with DIBAL-H.

  • Question 18
    1 / -0

    Which of the following statements is not correct?

    Solution

    Aldehydes and ketones have polar C=O group. Therefore they undergo nucleophilic addition reactions.

  • Question 19
    1 / -0

    What compound is produced when (CH3)2CHCH2Br is subjected to the following sequence of steps:
    1. Mg, Et2O 
    2. CO2
    3. H3O+?

    Solution

  • Question 20
    1 / -0

    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.

    Solution

    This is Etard Reaction.

  • Question 21
    1 / -0

    The oxidation of toluene to benzoic acid can be stopped at the aldehyde stage. The reaction is called?

    Solution

    Etard is specific reaction for conversion of toluene to Benzaldehyde.

  • Question 22
    1 / -0

    The compound obtained when acetaldehyde reacts with dilute aqueous sodium hydroxide exhibits:

    Solution

    CH3CH=CHCHO is the product which is suitably substituted so will show geometrical isomer.

  • Question 23
    1 / -0

    In Hell – Volhard Zelinsky reaction, halogen reacts with

    Solution

    Alpha Hydrogen containing carboxylic acids undergo HVZ reaction.

  • Question 24
    1 / -0

    The following reaction is

     

    Solution

    This is Wolff Kishner reduction of Carbonyls to alkanes.

  • Question 25
    1 / -0

    Many naturally occurring aldehydes and ketones are used in the blending of perfumes and flavouring agents. But the preferred ones are

    Solution

    Higher aldehydes are preferred.

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