Test: Comprehension Based Questions: Aldehydes, Ketones & Carboxylic Acids - JEE MCQ

PASSAGE-2

A carbonyl compound P,  which gives positive iodoform test, undergoes reaction with MeMgBr followed by dehydration to give an olefin Q. Ozonolysis of Q leads to a dicarbonyl compound R, which undergoes intramolecular aldol reaction to give predominantly S.

Q. The structure of the carbonyl compound P is

PASSAGE-2

A carbonyl compound P,  which gives positive iodoform test, undergoes reaction with MeMgBr followed by dehydration to give an olefin Q. Ozonolysis of Q leads to a dicarbonyl compound R, which undergoes intramolecular aldol reaction to give predominantly S.

Q. The structures of the products Q and R, respectively, are

PASSAGE-2

A carbonyl compound P,  which gives positive iodoform test, undergoes reaction with MeMgBr followed by dehydration to give an olefin Q. Ozonolysis of Q leads to a dicarbonyl compound R, which undergoes intramolecular aldol reaction to give predominantly S.

Q. The structure of the product S is

PASSAGE-3

Two aliphatic aldehydes P and Q react in the presence of aqueous K₂CO₃ to give compound R, which upon treatment with HCN provides compound S. On acidification and heating, S gives the product shown below

Q. The compounds P and Q respectively are :

PASSAGE-3

Two aliphatic aldehydes P and Q react in the presence of aqueous K₂CO₃ to give compound R, which upon treatment with HCN provides compound S. On acidification and heating, S gives the product shown below.

Q. The compound R is :

PASSAGE-3

Two aliphatic aldehydes P and Q react in the presence of aqueous K₂CO₃ to give compound R, which upon treatment with HCN provides compound S. On acidification and heating, S gives the product shown below.

Q. The compound S is :

PASSAGE-4

In the following reaction sequence, the compound J is an intermediate.

J (C₉H₈O₂) gives effervescence on treatment with NaHCO₃ and a positive Baeyer’s test.

Q. The compound I is

PASSAGE-4

In the following reaction sequence, the compound J is an intermediate.

J (C₉H₈O₂) gives effervescence on treatment with NaHCO₃ and a positive Baeyer’s test.

Q. The compound K is

PASSAGE-5

P and Q are isomers of dicarboxylic acid C₄H₄O₄. Both decolorize Br₂/H₂O. On heating, P forms the cyclic anhydride. Upon treatment with dilute alkaline KMnO₄, P as well as Q could produce one or more than one from S, T and U.

PASSAGE-5

P and Q are isomers of dicarboxylic acid C₄H₄O₄. Both decolorize Br₂/H₂O. On heating, P forms the cyclic anhydride. Upon treatment with dilute alkaline KMnO₄, P as well as Q could produce one or more than one from S, T and U.

Q. In the following reaction sequences V and W are respectively

PASSAGE-6

In the following reactions

Q. Compound X is

PASSAGE-6

In the following reactions

Q. The major compound Y is

Each of  this question contains STATEMENT-1 (Assertion/ Statement ) and STATEMENT-2 (Reason/Explanation) and has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.

Q. 

Statement-1 : Acetate ion is more basic than the methoxide ion.

Statement-2 : The acetate ion is resonance stabilized

Statement-1 : Acetic acid does not undergo haloform reaction.

Statement-2 : Acetic acid has no alpha hydrogens.

Statement-1 : Dimethyl sulphide is commonly used for the reduction of an ozonide of an alkene to get the carbonyl compounds.

Statement-2 : It reduces the ozonide giving water soluble dimethyl sulphoxide and excess of it evaporates.

Statement-1 : p-Hydroxybenzoic acid has a lower boiling point than o-hydroxybenzoic acid.

Statement-2 : o-Hydroxybenzoic acid has intramolecular hydrogen bonding.