Practice free Chemistry NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Wolff Kishner reduction reduces
The Wolff-Kishner reduction is used to reduce aldehydes and ketones to alkanes. It specifically reduces the -CHO group (aldehyde group) to a -CH2 group, effectively removing the oxygen.
Cyanohydrin of which of the following, forms lactic acid
Cyanohydrins are formed by the reaction of aldehydes or ketones with hydrogen cyanide (HCN). The cyanohydrin of acetaldehyde (CH3CHO) can be hydrolyzed to form lactic acid (2-hydroxypropanoic acid).
Carboxcylic acids are more acidic than phenol and alcohol because of
Carboxylic acids are more acidic than phenols and alcohols because their conjugate base (carboxylate ion) is resonance-stabilized. This means that the negative charge can be delocalized over two oxygen atoms, making the conjugate base more stable. Phenols and alcohols do not have this level of resonance stabilization for their conjugate bases.
When $ CH_2 = CH - COOH $ is reduced with $ LiAlH_4$ , the compound obtained will be
When $CH_2=CH-COOH$ (acrylic acid) is reduced with $LiAlH_4$, the double bond and the carboxylic acid group are both reduced. This reaction converts the carboxylic acid group ($-COOH$) to an alcohol ($-CH_2OH$) and the double bond ($C=C$) to a single bond ($C-C$), resulting in $CH_3-CH_2-CH_2OH$ (propyl alcohol).
Among the following acids which has the lowest pka vulue
Formic acid (HCOOH) has the lowest pKa value among the given options. This is because the formate ion (conjugate base of formic acid) is more stabilized by the absence of electron-donating groups, making formic acid more acidic compared to other carboxylic acids listed.
One of the following named reaction is an example of “disproportionation reactionâ€. Identify it.
The Cannizzaro reaction is a disproportionation reaction in which a non-enolizable aldehyde undergoes self-oxidation and self-reduction in the presence of a strong base to produce a primary alcohol and a carboxylic acid. This is a classic example of disproportionation, where the same substance is simultaneously oxidized and reduced.
Acetone and acetaldehyde are differentiated by
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.
Ready to ace NEET?
Free access · No credit card required
Yes. You can attempt every Chemistry question on this page for free without logging in, and check the correct answer with a detailed explanation instantly.
No account is required to attempt questions and view answers. A free account adds bookmarks, personal notes, and progress tracking.
The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.