Bihar Board Class 12 (Science) Aldehydes, Ketones and Carboxylic Acids — practice questions
101 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice Bihar Board Class 12 (Science) Aldehydes, Ketones and Carboxylic Acids in the app →Tollens' reagent gives a silver mirror with:The IUPAC name of the simplest aldehyde, $\mathrm{HCHO}$, isThe carbonyl carbon in an aldehyde or ketone isWhich carboxylic acid has the highest $K_a$ (i.e. is the most acidic)?The reaction of formaldehyde with concentrated NaOH is calledWhich catalyst is used in the Rosenmund reduction?Which named reaction reduces a nitrile to an imine with SnCl2 and HCl?Which reagent converts toluene to benzaldehyde in the Etard reaction?Benzene treated with carbon monoxide and HCl over anhydrous AlCl3 forms which product?Benzene reacts with acetyl chloride in the presence of anhydrous AlCl3. What is the main product?An acyl chloride treated with a dialkylcadmium compound gives which class of product?A nitrile is treated with a Grignard reagent and then hydrolysed. What is formed?Ozonolysis of but-2-ene followed by treatment with zinc dust and water gives which product?Which alkyne gives an aldehyde, rather than a ketone, on hydration with dilute H2SO4 and HgSO4?Vapours of a primary alcohol are passed over heated copper. Which compound forms?Side chain chlorination of toluene gives benzal chloride. What does its hydrolysis give?What does a strong oxidising agent normally convert toluene into?Which compound has the highest boiling point among these four of similar molecular mass?Why do aldehydes boil lower than comparable alcohols?How does the water solubility of aldehydes and ketones change as the alkyl chain gets longer?What intermediate forms when a nucleophile attacks the carbonyl carbon of an aldehyde?Why is benzaldehyde less reactive than propanal?Addition of HCN to an aldehyde or ketone produces which type of compound?Why is base added in HCN addition to carbonyls?An aldehyde reacts with two molecules of an alcohol in dry HCl. What is the gem-dialkoxy product called?A ketone reacts with ethylene glycol under acid catalysis. What are the cyclic products called?What does dry HCl do in acetal formation?Acetals and ketals are hydrolysed with aqueous mineral acid. What do they give?An aldehyde or ketone reacts with hydroxylamine. What type of derivative is formed?Which derivative forms when a carbonyl compound reacts with semicarbazide?What is the nature of 2,4-DNP derivatives of carbonyls?A substituted imine formed from a carbonyl compound and a primary amine is also called what?Which nucleophile converts a carbonyl compound into a hydrazone?Sodium borohydride reduces a ketone. What kind of compound results?Which reagent pair reduces the carbonyl group to a CH2 group in the Clemmensen reduction?Which reduction uses hydrazine, then KOH in ethylene glycol on heating?What is observed when an aldehyde is warmed with Tollens' reagent?What does warming an aliphatic aldehyde with Fehling's reagent produce?Which kind of aldehyde does not respond to Fehling's test?How are ketones oxidised, compared with aldehydes?Acetophenone is treated with sodium hypoiodite. Besides iodoform, which salt forms?Which compound gives a yellow precipitate of iodoform with I2 and NaOH?Why are the alpha hydrogens of aldehydes and ketones acidic?Which catalyst is used for the aldol reaction of aldehydes with alpha hydrogen?The name 'aldol' comes from which two functional groups in the product?An aldol or ketol readily loses what to give an unsaturated carbonyl compound?Cross aldol reaction between ethanal and propanal, both with alpha hydrogens, gives how many products?Benzaldehyde with concentrated NaOH gives which pair?What type of director is a ring carbonyl group?Bakelite is a resin made from phenol and which carbonyl compound?Which carbonyl compound is used in perfumery and in the dye industry?Fatty acids, found as glycerol esters in natural fats, contain roughly how many carbon atoms?Which acid takes its name from the Latin word for rancid butter?In IUPAC numbering of a carboxylic acid chain, the carboxyl carbon is given which number?What is the IUPAC name of CH3CH2COOH?Why is carboxylic carbon less electrophilic?What is Jones reagent?Which alkylbenzene resists oxidation to benzoic acid by hot KMnO4?Mild hydrolysis of a nitrile with acid or alkali stops at which stage?Grignard reagent plus CO2, then acid: change in chain length?Basic hydrolysis of an ester gives which species first, before acidification?Why are the higher carboxylic acids practically odourless?In which state do most carboxylic acids exist as dimers?Simple aliphatic carboxylic acids with up to how many carbons are miscible with water?Which test detects the carboxyl group by evolving CO2?Which is called the strongest carboxylic acid among these?Why is carboxylate ion more stable than phenoxide ion?How do electron withdrawing groups affect acid strength?Among Ph, Br, F and CF3, which substituent raises carboxylic acid strength the most?Why is SOCl2 preferred over PCl5 for converting RCOOH to RCOCl?Which reaction alpha-halogenates acids with Cl2 and red P?Which reagent reduces carboxylic acids to primary alcohols?C8H8O gives 2,4-DNP and iodoform tests, not Tollens'. What is it?Which reagent oxidises hexan-1-ol to hexanal only?Which reagent selectively reduces a nitrile to an imine that hydrolyses to an aldehyde?Aldehydes and ketones, unlike alkenes, mainly undergo which kind of addition?Which reagent reduces esters to aldehydes without further reduction?At what temperature is the DIBAl-H reduction of esters to aldehydes usually run?Which compounds are formed when an alkyl nitrile is hydrolysed with dilute acid and the amide is hydrolysed fuOxidation of toluene with alkaline KMnO4 followed by acidification gives which product?Which alkyl substituent on a benzene ring is NOT oxidised to a carboxyl group by KMnO4?A Grignard reagent reacts with solid carbon dioxide in dry ether; acid hydrolysis of the complex then gives whWhat is an aqueous solution of formaldehyde used to preserve biological specimens called?Which cyclic trimer of formaldehyde is a convenient solid source of the gas?Which one is a gas at room temperature with an irritating odour?Higher aliphatic carboxylic acids are best described as which kind of substances?What colour appears when an aldehyde is treated with Schiff's reagent?Tollens' reagent is best described as which solution?In the Fehling test, what is the red precipitate formed with an aldehyde?Besides aldehydes, which type of ketone also gives a positive Fehling test?Why are ketones not oxidised by mild oxidising agents?What does Tollens' reagent oxidise an aldehyde to, while silver ion is reduced?Which reagent pair carries out the Clemmensen reduction of a carbonyl compound?Which solvent is used in the Wolff-Kishner reduction because of its high boiling point?In both Clemmensen and Wolff-Kishner reductions, the carbonyl oxygen is replaced by what?Hydrogen cyanide adds across the C=O bond of an aldehyde to give which compound?Benzaldehyde heated with concentrated KOH gives benzyl alcohol and which other product?In the Cannizzaro reaction, how does the second aldehyde become an alcohol?What is the maximum theoretical yield of the alcohol in a Cannizzaro reaction, as a share of the aldehyde usedTreating propionic acid with Br2 and PBr3 followed by ammonia can be used to prepare which amino acid?In the Tishchenko reaction, using an alkoxide base instead of hydroxide gives which type of product?