Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Alcohols Phenols and Ethers question

2022 · 29 Jun · Shift 1 · Q10
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /JEE Main
  3. /Chemistry
  4. /Alcohols Phenols and Ethers
  5. /2022 · 29 Jun · Shift 1 · Q10

Alcohols Phenols and Ethers question

2022 · 29 Jun · Shift 1 · Q10

JEE MainChemistryAlcohols Phenols and EthersMCQ+4 / −1
Given below are two statements : Statement I : Phenols are weakly acidic. Statement II : Therefore they are freely soluble in NaOH solution and are weaker acids than alcohols and water. Choose the most appropriate option :
  1. A
    Both Statement I and Statement II are correct.
  2. B
    Both Statement I and Statement II are incorrect.
  3. C
    Statement I is correct but Statement II is incorrect.
  4. D
    Statement I is incorrect but Statement II is correct.
View written solutionFree

Correct answer: C

  1. Analyze Statement I: Phenols are weakly acidic.

    This is correct.

    • Phenol can lose a proton to form phenoxide ion: C6H5OH⇌C6H5O−+H+\mathrm{C_6H_5OH \rightleftharpoons C_6H_5O^- + H^+}C6​H5​OH⇌C6​H5​O−+H+
    • The phenoxide ion is stabilized by resonance, so phenol shows acidic character.
    • However, it is only weakly acidic, not a strong acid.

  2. Analyze Statement II: Therefore they are freely soluble in NaOH solution and are weaker acids than alcohols and water.

    This statement has two parts:

    (a) Phenols are freely soluble in NaOH solution

    • Phenol reacts with NaOH to form sodium phenoxide, which is soluble: C6H5OH+NaOH→C6H5ONa+H2O\mathrm{C_6H_5OH + NaOH \rightarrow C_6H_5ONa + H_2O}C6​H5​OH+NaOH→C6​H5​ONa+H2​O
    • So this part is correct in essence.

    (b) Phenols are weaker acids than alcohols and water

    • This is incorrect.
    • Phenols are actually more acidic than alcohols and water because the conjugate base, phenoxide ion, is resonance stabilized.
    • Alcohols do not have such resonance stabilization.

    Since the second statement as a whole contains an incorrect conclusion, Statement II is incorrect.

  3. Choose the correct option:

    • Statement I: Correct
    • Statement II: Incorrect

    Therefore, the correct option is: C\boxed{\text{C}}C​

  4. Comparison with stored correct answer:

    • Derived answer: C
    • Stored correct answer: C
    • They match.
PreviousNext

More from Alcohols Phenols and Ethers

  • The number of chiral alcohol(s) with molecular formula C4​H10​O is ​.2022 · Numerical
  • In the given reaction, the number of sp2 hybridised carbon(s) in compound 'X' is ​. Includes diagram2022 · Numerical
  • Consider the above reaction sequence. Identify the component A and component B : Includes diagram2022 · MCQ
  • The structure of X is : Includes diagram2021 · MCQ
  • To synthesize 1.0 mole of 2-methylpropan-2-ol from Ethylethanoate ​ equivalents of CH3​MgBr Reagent will be required. (Integer value)2021 · Numerical
  • In the given reaction 3-Bromo-2, 2-dimethyl butane C2​H5​OH​(MajorProduct)′A′​ Product A is :2021 · MCQ
  • An organic compound A (C6​H6​O) gives dark green colouration with ferric chloride. On treatment with CHCl3​ and KOH, followed by acidification gives compound B. Compound B can also be obtained from compound C on reaction with…2021 · MCQ
  • Which of the following compounds will provide a tertiary alcohol or reaction with excess of CH3​MgBr followed by hydrolysis?2021 · MCQ