- Home
- General Science
Organic Chemistry -- Reaction Mechanisms
21.
On heating phenylacetate in the presence of anhydrous aluminium chloride, we obtain
- A.only o-hydroxy acetophenone
- B.only p-hydroxy acetophenone
- C.a mixture of o- and p-hydroxy acetophenone
- D.none of these
- Answer
- Report
Answer : [C]
22.
The reaction of an acid chloride with diazomethane followed by
treatment with water gives a carboxylic acid. The reaction occurs
through the intermediate formation of
- A.carbene
- B.ketene
- C.benyne
- D.a carbocation
- Answer
- Report
Answer : [B]
23.
In the Baeyer–Villiger oxidation of alkyl aryl ketones, it is the more electron-releasing group that migrates. The aptitude of migration of the aryl groups is of the order
- A.p-chlorophenyl > p-anisyl > p-tolyl > phenyl
- B.phenyl > p-tolyl > p-anisyl > p-chlorophenyl
- C.p-anisyl > p-tolyl > phenyl >p-chlorophenyl
- D.p-chlorophenyl > phenyl > p-tolyl > p-anisyl
- Answer
- Report
Answer : [C]
24.
On treatment with NaOH an oxime of 2-bromo-5-nitroacetophenone did
not undergo any change. However, on subjecting it to Beckmann
rearrangment, N-(2-bromo-5-nitrophenyl) acetamide was obtained. On
the basis of these observations, it may be concluded that the starting
oxime has
- A.only an anti- or trans-structure
- B.only a syn- or cis-structure
- C.a mixture of syn- and anti-oximes
- D.none of these
- Answer
- Report
Answer : [B]
25.
Maleic anhydride undergoes a Diels-Alder reaction with
- A.benzene
- B.naphthalene
- C.phenanthrene
- D.anthracene
- Answer
- Report
Answer : [D]
|
|
||||||||||||||||||||||||||||
