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Topic Question Set

Q 1 :

Given below are two statements:

Statement (I): p-Nitrophenol is more acidic than m-nitrophenol and o-nitrophenol.

Statement (II): Ethanol will give immediate turbidity with Lucas reagent.  

In the light of the above statements, choose the correct answer from the options given below:        [2023]

  • Statement I is false but Statement II is true

     

  • Both Statement I and Statement II are false

     

  • Both Statement I and Statement II are true

     

  • Statement I is true but Statement II is false

     

(4)

Statement I: Nitro group from ortho and para positions exert –M and –I effect, but from meta position it can exert only –I effect. Therefore, p-nitrophenol and o-nitrophenol are more acidic than m-nitrophenol. In o-nitrophenol, –I effect of nitro group is more than that at para position, and presence of phenolic H is involved in intramolecular hydrogen bonding with nitro group and hence is difficult to remove in comparison to para isomer. Thus acidic strength order is: p-nitrophenol > o-nitrophenol > m-nitrophenol. So, statement I is true.

Statement II: Primary alcohols (like ethanol) react with Lucas reagent only upon heating; at room temperature primary alcohols show no reaction with Lucas reagent. So, statement II is false.