Practice free Aldehyde ketones & carboxylic Acid (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which is not true about acetophenone?
Acetophenone does not react with Tollen's reagent to form a silver mirror. Tollen's reagent is used to detect aldehydes, not ketones. Acetophenone is a ketone, so it does not give a positive Tollen's test.
Which of the following pairs can be distinguished by sodium hypoiodite
Sodium hypoiodite test is used to distinguish between aldehydes and ketones. Aldehydes react with sodium hypoiodite to form a yellow precipitate of iodoform, whereas ketones do not react in this manner. In the options provided, $CH_3CH_2CHO$ (an aldehyde) can be distinguished from $CH_3COCH_3$ (a ketone) using sodium hypoiodite.
Identify the correct statement.
Arrange the following compounds in increasing order of the reactivity in nucleophilic addition reactions Ethanal (I), Propanal(II), Propanone (III), Butanone (IV)
The reactivity of carbonyl compounds in nucleophilic addition reactions decreases with the increase in steric hindrance and electron-donating alkyl groups. Hence, the order of reactivity is: Butanone (IV) < Propanone (III) < Propanal (II) < Ethanal (I).
Ketones reacts with Mg-Hg over water gives
When ketones react with magnesium amalgam (Mg-Hg) over water, pinacols are formed. This reaction is known as the pinacol coupling reaction. The ketone is reduced to a diol (pinacol) through an intermediate radical mechanism.
In the presence of a dilute base, $ C_6 H_5CHO and CH_3CHO$ react together to give _____product .
In the presence of a dilute base, benzaldehyde (C6H5CHO) and acetaldehyde (CH3CHO) undergo a crossed aldol condensation to form cinnamaldehyde (C6H5-CH=CH-CHO). The reaction involves the formation of a β-hydroxy aldehyde intermediate, which then dehydrates to give the α,β-unsaturated aldehyde product.
Choose the weakest acid among the following.
The weakest acid among the given options is isobutyric acid ((CH3)2CH COOH). The presence of electron-donating alkyl groups (CH3) reduces the acidity of the carboxylic acid group by increasing electron density around it and thus making it less likely to donate a proton.
Among the following compounds, the most acidic is
The most acidic compound among the given options is o-hydroxybenzoic acid. This is because of the intramolecular hydrogen bonding which stabilizes the conjugate base, making it easier for the compound to lose a proton (H+). In o-hydroxybenzoic acid, the hydroxyl group at the ortho position relative to the carboxyl group helps to stabilize the negative charge on the oxygen atom after deprotonation, increasing its acidity.
$ HNO_3 $ in aqueous solution yields
The number of P-O-P bonds in cyclic metaphos phoric acid is
Cyclic metaphosphoric acid ( ext{HPO}_3)_n contains three ext{P-O-P} bonds in its ring structure. The structure can be represented as a cyclic trimer with the formula ( ext{HPO}_3)_3. Each phosphorus atom is bonded to two oxygen atoms, which in turn are bonded to two different phosphorus atoms, creating three ext{P-O-P} linkages.
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