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12th Standard Chemistry Hydroxy Compounds and Ethers English Medium Free Online Test One Mark Questions 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. An alcohol (x) gives blue colour in victormayer’s test and 3.7g of X when treated with metallic sodium liberates 560 mL of hydrogen at 273 K and 1 atm pressure what will be the possible structure of X?

    (a)

    CH3 CH (OH) CH2CH3

    (b)

    CH3 – CH (OH) – CH3

    (c)

    CH3 – C (OH) – (CH3)2

    (d)

    CH3- CH2 –CH (OH) – CH2 – CH3

  2. The X is

    (a)

    (b)

    (c)

    (d)

    None of these

  3. Which one of the following is the strongest acid

    (a)

    2 - nitrophenol

    (b)

    4 – chlorophenol

    (c)

    4– nitrophenol

    (d)

    3 – nitrophenol

  4. Carbolic acid is

    (a)

    Phenol

    (b)

    Picri cacid

    (c)

    benzoic acid

    (d)

    phenylacetic acid

  5. Assertion : Phenol is more acidic than ethanol
    Reason: Phenoxide ion is resonance stabilized
    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.

  6. HO CH2 CH2 – OH on heating with periodic acid gives

    (a)

    methanoic acid

    (b)

    Glyoxal

    (c)

    methanol

    (d)

    CO2

  7. The reactions
     is an example of

    (a)

    Wurtz reaction

    (b)

    cyclic reaction

    (c)

    Williamson reaction

    (d)

    Kolbe reactions

  8. Among the following ethers which one will produce methyl alcohol on treatment with hot HI?

    (a)

    (H3C)-3C-|-O-CH3

    (b)

    (CH3-)2-CH-CH2-O-CH3

    (c)

    CH3-(CH2)3-O-CH3

    (d)

    CH3-CH2-\(\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } \)-O-CH3

  9. On reacting with neutral ferric chloride, phenol gives

    (a)

    red colour

    (b)

    violet colour

    (c)

    dark green colour

    (d)

    no colouration.

  10. Which among the following alkene on acid hydration will produce tertiary butyl alcohol?

    (a)

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

    (b)

    CH3-CH=CH2

    (c)

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

    (d)

    CH3-CH2-CH=CH-CH3

  11. Which one of the alcohol cannot be prepared by grignard reagent?

    (a)

    Methanol

    (b)

    ethanol

    (c)

    iso propyl alcohol

    (d)

    phenyl methanol

  12. Which among the following reagent is not used to differentiate ethanol and phenol?

    (a)

    neutral FeCl3

    (b)

    C6H5N2CI

    (c)

    NaOH

    (d)

    anhy ZnCl2

  13. Glycol \(\overset { 773K }{ \longrightarrow } \) 'A'. Identify 'A'

    (a)

    (b)

    \(\overset { { CH }_{ 3 } }{ \underset { CHO }{ | } } \)

    (c)

    (d)

  14. Which among the following sets of reactants will produce anisole?

    (a)

    HCHO, RMgX

    (b)

    (c)

    C6H5ONa, CH3Br

    (d)

    C6H5CH3, CH3CoCI

  15. Which is soluble in H2O?

    (a)

    Phenol

    (b)

    Alkanes

    (c)

    Alcohols

    (d)

    Alkenes

  16. The ionization constant of phenol is higher than that of ethanol because

    (a)

    phenoxide ion is bulkier than ethoxide

    (b)

    phenoxide ion is stronger base than ethoxide.

    (c)

    phenoxide ion is stablized through delocalisation.

    (d)

    phenoxide ion is less stable than ethoxide ion.

  17. p-Nitrophenol is having lower pKa value than phenol because

    (a)

    phenol is more acidic than p-nitro phenol

    (b)

    anion of P-nitro phenol is more stabilised by resonance than that of phenol.

    (c)

    degree of ionisation of p-nitro phenol is less than that of phenol

    (d)

    anion of p-nitro phenol is less stable than that of phenol.

  18. Ethylene diamine is converted to ethylene glycol using

    (a)

    Na2CO3 solution

    (b)

    Nitrous acid

    (c)

    NaHCO3 (aqueous)

    (d)

    Baeyer's reagent

  19. When alcohols are converted to alkyl chlorides by thionyl chloride in presence of pyridine the intermediate formed is _________

    (a)

    sulphonium ion

    (b)

    chlorosulphonic acid

    (c)

    alkyl chlorosulphite

    (d)

    chlorosulphite

  20. Identify the major product in the given reaction

    (a)

    (b)

    (c)

    (d)

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