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JEE Advanced (Fill in the Blanks): Alcohols, Phenols & Ethers | Chapter-wise Tests for JEE Main & Advanced PDF Download

Fill in the Blanks

1. Ethanol vapour is passed over heated copper and the product is treated with aqueous NaOH. The final product is ............... . (1983 - 1 Mark)

Ans: aldol (β-hydroxybutanal)

Solution:

JEE Advanced (Fill in the Blanks): Alcohols, Phenols & Ethers | Chapter-wise Tests for JEE Main & Advanced


2. The acidity of phenol is due to the ............... of its anion. (1984 - 1 Mark)

Ans: resonance stabilization


3. Formation of phenol from chlorobenzene is an example of ............... aromatic substitution. (1989 - 1 Mark)

Ans: nucleophilic


4. Phenol is acidic because of resonance stabilization of its conjugate base, namely ............... . (1990 - 1 Mark)

Ans: phenoxide ion


5. Aliphatic ethers are purified by shaking with a solution of ferrous salt to remove ............... which are formed on prolonged standing in contact with air. (1992 - 1 Mark)

Ans: peroxides

Solution: On standing in contact with air, ethers are converted into unstable peroxides (R2O → O) which are highly explosive even in low concentrations. Hence ether
is always purified before distillation. Purification (removal of peroxides) can be done by washing ether with a solution of ferrous salt (which reduces peroxides to alcohols) or by
distillation with conc. H2SO4 (which oxidises peroxides)


6. Glycerine contains one .................. hydroxy group. (1997 - 1 Mark)

 

Ans: secondary

 

 

True / False

1. Sodium ethoxide is prepared by reacting ethanol with aqueous sodium hydroxide.

 

Ans: False

Solution: Ethanol is not acidic enough to react with aq. NaOH. Thus sod. ethoxide (C2H5ONa) is prepared by the reaction of Na metal with ethyl alcohol.
JEE Advanced (Fill in the Blanks): Alcohols, Phenols & Ethers | Chapter-wise Tests for JEE Main & Advanced

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