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12th Standard Chemistry Hydroxy Compounds and Ethers 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. Which of the following compounds on reaction with methyl magnesium bromide will give tertiary alcohol.

    (a)

    benzaldehyde

    (b)

    propanoic acid

    (c)

    methyl propanoate

    (d)

    acetaldehyde

  2. In the reaction sequence, Ethane \(\overset { HOCl }{ \longrightarrow } A\overset { x }{ \longrightarrow } \) ethan -1, 2 - diol . A and X respectively are

    (a)

    Chloroethane and NaOH

    (b)

    ethanol and H2SO4

    (c)

    2 – chloroethan -1-ol and NaHCO3

    (d)

    ethanol and H2O

  3. on treatment with Con H2SO4, predominately gives

    (a)

    (b)

    (c)

    (d)

  4. Which one of the following will react with phenol to give salicyladehyde after hydrolysis.

    (a)

    Dichlo methane

    (b)

    trichloroethane

    (c)

    trichloro methane

    (d)

    CO2

  5. The correct IUPAC name of the compound, 

    (a)

    4 – chloro – 2,3 – dimethyl pentan – 1-ol

    (b)

    2,3 – dimethyl – 4- chloropentan -1-ol

    (c)

    2,3,4 – trimethyl – 4- chlorobutan -1-ol

    (d)

    4– chloro – 2,3,4 – trimethyl pentan – 1-ol

  6. Assertion : Phenol is more reactive than benzene towards electrophilic substitution reaction
    Reason : In the case of phenol, the intermediate arenium ion is more stabilized by resonance
    Codes:
    (a) if both assertion and reason are true and reason is the correct explanation of assertion.
    (b) if both assertion and reason are true but reason is not the correct explanation of assertion.
    (c) assertion is true but reason is false
    (d) both assertion and reason are false.

    (a)

    if both assertion and reason are true and reason is the correct explanation of assertion.

    (b)

    if both assertion and reason are true but reason is not the correct explanation of assertion.

    (c)

    assertion is true but reason is false

    (d)

    both assertion and reason are false.

  7. Which of the following compound can be used as artireeze in automobile rediators?

    (a)

    methanol

    (b)

    ethanol

    (c)

    Neopentyl alcohol

    (d)

    ethan -1, 2-diol

  8. One mole of an organic compound (A) with the formula C3H8O reacts completely with two moles of HI to form X and Y. When Y is boiled with aqueous alkali it forms Z. Z answers the iodoform test. The compound (A) is

    (a)

    propan – 2-ol

    (b)

    propan -1-ol

    (c)

    ethoxy ethane

    (d)

    methoxy ehane

  9. Isoprophylbenzene on air oxidation in the presence of dilute acid gives

    (a)

    C6H5COOH

    (b)

    C6H5COCH3

    (c)

    C6H5COC6H5

    (d)

    C6H5- OH

  10. Which among the following statement are correct with regard to alkyl halides?

    (a)

    Alkyl halides on heating with aq NaOH gives alcohols

    (b)

    10 alkyl halides proceed by SN2 mechanism

    (c)

    20 and 30 alkyl halides undergo substitution by SN1 mechanism

    (d)

    all the above

  11. Which one of the following alcohols on oxidation gives carboxylic acid with lesser number of carbon atoms?

    (a)

    (CH3)2-CH- CH2OH

    (b)

    CH3CH2CHOHCH3

    (c)

    CH3-(CH2)3-CH2OH

    (d)

    both (a) and (c)

  12. Which one of the following would not react with cone. HCI and anhy. ZnCl2 at room temperature?

    (a)

    (CH3)3COH

    (b)

    (CH3)2CHOH

    (c)

    \({ CH }_{ 3 }-{ CH }_{ 2 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } -OH\)

    (d)

    CH3CH2CH2OH


  13. The above reaction is called

    (a)

    Gattermann reaction

    (b)

    Williamson ether synthesis

    (c)

    Swern's reaction

    (d)

    Riemer tiemann reaction

  14. In the sequence of reactions Identify 'C'.

    (a)

    (b)

    (c)

    (d)

  15. When phenol is distilled with zinc dust it gives

    (a)

    benzaldehyde

    (b)

    benzoic acid

    (c)

    toluene

    (d)

    benzene

  16. 1-Propanol and 2- propanol can be best distinguished by

    (a)

    oxidation with KMnO4 followed by reaction with Fehling solution

    (b)

    oxidation with acidic dichromate followed by reaction with Fehling solution

    (c)

    oxidation by heating with copper followed by reaction with Fehling solution

    (d)

    oxidation with concentrated H2SO4 followed by reaction with Pehling solution

  17. The reactivity of alcohols with respect to oxidation decreases with

    (a)

    increase in α - H

    (b)

    decrease in α - H

    (c)

    increase in β - H

    (d)

    decrease in β - H

  18. The IUP.AC name of 

    (a)

    2-methyl-2-propanol

    (b)

    2-methyl-l-butanol

    (c)

    2,3- dimethyl tributanol

    (d)

    2,3-dimethyl-2-butanol

  19. Alcohols are isomeric with

    (a)

    aldehyde

    (b)

    ketones

    (c)

    ethers

    (d)

    esters

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