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Alcohol, Phenol...

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  • Question 1
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    Directions : In this question, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

    Assertion (A): (CH3)3C−O−CH3 gives (CH3)3C−I and CH3OH on treatment with HI.
    Reason (R): The reaction occurs by SN1 mechanism.

  • Question 2
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    Directions : In this question, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

    Assertion (A): Ethers behave as bases in the presence of mineral acids.
    Reason (R) : In ethers, oxygen consists of lone pair of electrons.

  • Question 3
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    Directions : In this question, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

    Assertion (A): Methoxy ethane reacts with HI to give ethanol and iodomethane.
    Reason (R): Reaction of ether with HI follows SN2 mechanism.

  • Question 4
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    Directions : In this question, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

    Assertion (A): Ortho and para-nitrophenol can be separated by steam distillation.
    Reason (R): Ortho isomer associates through intermolecular hydrogen bonding while para isomer associates through intermolecular hydrogen bonding.

  • Question 5
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    Directions : In this question, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

    Assertion (A): Carboxylic acids are more acidic than phenols.
    Reason (R): Phenols are ortho and para directing.

  • Question 6
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    Directions : In this question, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

    Assertion (A) : The C-O-C bond angle in ethers is slightly less than tetrahedral angle.
    Reason (R): Due to the repulsive interaction between the two alkyl groups in ethers.

  • Question 7
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    Directions : In this question, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

    Assertion : In Lucas test, 3º alcohols react immediately.
    Reason : An equimolar mixture of anhyd. ZnCl2 and conc. HCl is called Lucas reagent.

  • Question 8
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    Directions : In this question, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

    Assertion : Phenol is more reactive than benzene towards electrophilic substitution reaction.
    Reason : In the case of phenol, the intermediate carbocation is more resonance stabilized.
     

  • Question 9
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    Directions : In this question, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

    Assertion : ter – Butyl methyl ether is not prepared by the reaction of ter-butyl bromide with sodium methoxide.
    Reason : Sodium methoxide is a strong nucleophile.

  • Question 10
    1 / -0

    Directions : In this question, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

    Assertion : With HI, anisole gives iodobenzene and methyl alcohol.
    Reason : Iodide ions combine with smaller groups to avoid steric hindrance.

  • Question 11
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    Directions : In this question, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

    Assertion : Ethyl phenyl ether on reaction with HBr form phenol and ethyl bromide.
    Reason : Cleavage of C–O bond takes place on ethyl￾oxygen bond due to the more stable phenyl-oxygen bond.

  • Question 12
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    Directions : In this question, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

    Assertion : The bond angle in alcohols is slightly less than the tetrahedral angle.
    Reason : In alcohols, the oxygen of –OH group is attached to sp3 hybridized carbon atom.

  • Question 13
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    Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

    Assertion : Reimer-Tiemann reaction of phenol with CCl4 in NaOH at 340 K gives salicyclic acid as the major product.
    Reason : The reaction occurs through intermediate formation of dichlorocarbene.

  • Question 14
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    Directions : In this question, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

    Assertion : In case of phenol, bromination takes place even in absence of Lewis acid whereas bromination of benzene takes place in presence of Lewis acid like FeBr3.
    Reason : – OH group attached to benzene ring is highly deactivating.

  • Question 15
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    Directions : In this question, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

    Assertion : Ethers behave as bases in the presence of mineral acids.
    Reason : Due to the presence of lone pairs of electrons on oxygen.

  • Question 16
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    Directions : In this question, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

    Assertion : With HI at 373 K, ter-butyl methyl ether gives ter-butyl iodide and methanol.
    Reason : The reaction occurs by SN2 mechanism.

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