Alcohols, Phenols and Ethers

JEE Chemistry · 44 questions · Page 5 of 5 · Click an option or "Show Solution" to reveal answer

Q41

The best reagent to convert pent -3- en-2-ol into pent -3-en-2-one is

A Acidic permanganate

B Acidic dichromate

C Chromic anhydride in glacial acetic acid

D Pyridinium chloro – chromate

Correct Answer

Option D

Solution

Pyridiminum chloro-chromate

(PCC)

is specific for the conversion.

Q42

Ceric ammonium nitrate and CHCl3/alc. KOH are used for the identification of functional groups present in __________ and _______ respectively.

A amine, alcohol

B alcohol, phenol

C alcohol, amine

D amine, phenol

Correct Answer

Option C

Solution

Alcohol give positive test with ceric ammonium nitrate and primary amines gives carbyl amine test with CHCl3, KOH.

Q43

The difference in the reaction of phenol with bromine in chloroform and bromine in water medium is due to :

A Hyperconjugation in substrate

B Polarity of solvent

C Free radical formation

D Electromeric effect the substrate

Correct Answer

Option B

Solution

Phenol gives different products with bromine in chloroform and water medium due to the polarity difference between chloroform and water acting as solvent

Q44

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R Assertion A : Butylated hydroxy anisole when added to butter increases its shelf life. Reason R : Butylated hydroxy anisole is more reactive towards oxygen than food. In the light of the above statements, choose the most appropriate answer from the options given below

A A is correct but R is not correct

B Both A and R are correct but R is NOT the correct explanation of A

C Both A and R are correct and R is the correct explanation of A

D A is not correct but R is correct

Correct Answer

Option C

Solution

Butylated hydroxy anisole is added to butter to increase its shelf life from months to years as it is more reactive towards oxygen than food.

Therefore, both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

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