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12th Standard Chemistry Carbonyl Compounds English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021

12th Standard

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Chemistry

Time : 00:20:00 Hrs
Total Marks : 20
    Answer all the questions
    20 x 1 = 20
  1. The formation of cyanohydrin from acetone is an example of

    (a)

    nucleophilic substitution

    (b)

    electrophilic substitution

    (c)

    electrophilic addition

    (d)

    Nucleophilic addition

  2. Predict the product Z in the following series of reactions Ethanoic acid \(\overset { { PCI }_{ 5 } }{ \longrightarrow } X\overset { { C }_{ 6 }{ H }_{ 6 } }{ \underset { Anhydrous \ AlcI }-_{3}{ \longrightarrow } } Y\overset { 1){ CH }_{ 3 }MgBr }{ \underset { II){ H }_{ 3 }{ O }^{ + } }{ \longrightarrow } } Z.\)

    (a)

    (CH3)2 C(OH)C6H5

    (b)

    CH3CH(OH)C6H5

    (c)

    CH3CH(OH)CH2- CH3

    (d)

  3. Which of the following represents the correct order of acidity in the given compounds

    (a)

    FCH2COOH > CH3COOH > BrCH2COOH > ClCH2COOH

    (b)

    FCH2COOH > ClCH2COOH > BrCH2COOH > CH3COOH

    (c)

    CH3COOH > ClCH2COOH > FCH2COOH > Br-CH2COOH

    (d)

    Cl CH2COOH > CH3COOH > BrCH2COOH > ICH2COOH

  4. The IUPAC name of 

    (a)

    but – 3- enoicacid

    (b)

    but – 1- ene-4-oic acid

    (c)

    but – 2- ene-1-oic acid

    (d)

    but -3-ene-1-oicacid

  5. In which case chiral carbon is not generated by reaction with HCN

    (a)

    (b)

    (c)

    (d)

  6. Which one of the following reaction is an example of disproporationation reaction

    (a)

    Aldol condensation

    (b)

    cannizaro reaction

    (c)

    Benzoin condensation

    (d)

    none of these

  7. The reagent used to distinguish between acetaldehyde and benzaldehyde is

    (a)

    Tollens reagent

    (b)

    Fehling’s solution

    (c)

    2,4 – dinitrophenyl hydrazine

    (d)

    semicarbazide

  8. Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their

    (a)

    more extensive association of carboxylic acid via van der Waals force of attraction

    (b)

    formation of carboxylate ion

    (c)

    formation of intramolecular H-bonding

    (d)

    formation of intermolecular H – bonding

  9. Cannizaro reaction is not given by

    (a)

    (b)

    (c)

    CH3CHO

    (d)

    HCHO

  10. Identify 'X'.

    (a)

    (b)

    (c)

    (d)

  11. A compound 'X' when mixed with ethanol and a drop of concentrated H2SO4 gave a compound with fruity odour. Identify 'X'.

    (a)

    HCHO

    (b)

    CH3OH

    (c)

    CH3COOH

    (d)

    CH3NH2

  12. Methyl ketones are usually characterised by

    (a)

    the Fehling's solution

    (b)

    the iodoform test

    (c)

    the Schiff's test

    (d)

    the Tollen's reagent

  13. Formaldehyde polymerises to give

    (a)

    paraldehyde

    (b)

    paraformaldhyde

    (c)

    formalin

    (d)

    formic acid

  14. Tincture benzoin is obtained from

    (a)

    benzoyl chloride

    (b)

    benzoin

    (c)

    benzyl alcohol

    (d)

    benzoic acid

  15. In the reduction of acetaldehyde using LiAlH4 the hydride ion acts as

    (a)

    electrophile

    (b)

    nucleophile

    (c)

    both (a) and (b)

    (d)

    a free radical

  16. Bakelite is a product of reaction between

    (a)

    formaldehyde and NaOH

    (b)

    phenol and methanal

    (c)

    aniline and NaOH

    (d)

    aniline and NaOH

  17. LiAlH4 and NaBH4 are

    (a)

    H+ donor

    (b)

    H-donor

    (c)

    H-acceptor

    (d)

    None

  18. Partial reduction of acetic acid in the presence of LiAl H4 results in the formation of ________.

    (a)

    ethane

    (b)

    ethanol

    (c)

    ethene

    (d)

    ethyne

  19. Benzoic acid does not undergo Friedel crafts reaction due _________.

    (a)

    resonancein benzene

    (b)

    strong deactivating nature of the carboxyl group

    (c)

    due to its higher pka, value

    (d)

    all the above

  20. The most acidic among the following is ________.

    (a)

    p- nitrophenol

    (b)

    p- hydroxybenzoicacid

    (c)

    o- hydroxy benzoic acid

    (d)

    p- toluic acid

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