Conversion of alkyl halide into alcohol using aqueous KOH is an example of
A elimination reaction
B nucleophilic substitution
C electrophilic substitution
D rearrangement
OH⁻ acts as nucleophile and replaces halide ion.
Reaction of alkyl halide with alcoholic KOH mainly gives
A alcohol
B alkene
C ether
D aldehyde
Alcoholic KOH favours β-elimination (E2).
Wurtz reaction is used for the preparation of
A alkenes
B alkynes
C higher alkanes
D alcohols
Coupling of alkyl halides with Na in dry ether.
In Wurtz reaction, the reagent used is
A Zn / alcohol
B Na / dry ether
C Mg / ether
D AlCl₃
Sodium metal promotes coupling of alkyl halides.
Finkelstein reaction involves conversion of
A R–Cl to R–I
B R–I to R–Cl
C alcohol to alkyl halide
D alkene to alkane
NaI in acetone converts chloro/bromo alkanes to iodoalkanes.
Swarts reaction is used to prepare
A alkyl iodides
B alkyl bromides
C alkyl fluorides
D alcohols
Replacement of Cl/Br by F using metal fluorides.
Kolbe’s electrolytic reaction gives
A alcohols
B alkenes
C alkanes with even number of carbon atoms
D acids
Electrolysis of carboxylate salts forms coupled alkanes.
Decarboxylation of sodium salt of acid using soda lime gives
A alkene
B alcohol
C alkane with one carbon less
D aldehyde
CO₂ is removed from carboxylate ion.
Friedel–Crafts alkylation requires
A ZnCl₂
B AlCl₃
C FeCl₃
D H₂SO₄
Lewis acid generates carbocation from alkyl halide.
Friedel–Crafts reaction does NOT occur with
A benzene
B chlorobenzene
C nitrobenzene
D toluene
Strongly deactivated ring due to −NO₂ group.
Rearrangement is common in
A SN2 reactions
B E2 reactions
C carbocation reactions
D radical reactions only
Carbocations rearrange to achieve greater stability.
Hydride shift involves migration of
A H⁺
B H•
C H⁻
D H₂
Hydride migrates with bonding electron pair.
Which rearrangement converts oxime into amide
A Beckmann rearrangement
B Pinacol rearrangement
C Hofmann rearrangement
D Curtius rearrangement
Oxime rearranges to amide in acidic medium.
Pinacol rearrangement converts
A diol into ketone
B ketone into alcohol
C aldehyde into acid
D amide into amine
Acid-catalysed rearrangement of vicinal diols.
Hofmann rearrangement converts amide into
A alcohol
B amine with same carbon number
C amine with one carbon less
D nitrile
Loss of carbonyl carbon occurs.
Reagent used in Hofmann rearrangement is
A Br₂ / NaOH
B NaNO₂ / HCl
C PCl₅
D AlCl₃
Hypobromite is the active species.
Curtius rearrangement involves conversion of
A acid chloride to amine
B acyl azide to amine
C nitrile to amide
D ketone to alcohol
Nitrogen expulsion gives isocyanate intermediate.
Which rearrangement proceeds through nitrene intermediate
A Beckmann
B Hofmann
C Curtius
D Pinacol
Acyl azide decomposes to nitrene-like species.
Cannizzaro reaction is shown by aldehydes
A having α-hydrogen
B without α-hydrogen
C all aldehydes
D aromatic ketones
Disproportionation occurs under strong base.
Cannizzaro reaction produces
A two alcohols
B two acids
C alcohol and acid
D ester
One molecule oxidised, other reduced.
Aldol condensation occurs in aldehydes having
A no α-hydrogen
B α-hydrogen
C aromatic ring
D nitro group
Enolate ion formation is essential.
Aldol condensation gives initially
A α,β-unsaturated compound
B β-hydroxy aldehyde
C acid
D ester
Dehydration later gives unsaturated product.
Cross-aldol condensation is difficult due to
A slow reaction
B multiple products
C no base required
D rearrangement
Both carbonyl compounds can act as nucleophile or electrophile.
Perkin reaction gives
A aromatic acid
B α,β-unsaturated aromatic acid
C aliphatic alkene
D ester
Condensation of aromatic aldehyde with acid anhydride.
Reimer–Tiemann reaction introduces which group in phenol
A –COOH
B –CHO
C –CH₃
D –NO₂
Formylation at ortho position using CHCl₃/NaOH.
Gattermann reaction is used for
A nitration
B formylation
C halogenation
D sulphonation
Introduction of –CHO using HCN and HCl.
Sandmeyer reaction converts
A alcohol to halide
B amine to diazonium salt
C diazonium salt to halide
D nitro compound to amine
Cu(I) salts replace diazonium group.
Diazotization of aniline requires temperature
A above 50°C
B room temperature
C 0–5°C
D −20°C
Diazonium salts are stable only at low temperature.
Rosenmund reduction converts
A acid to aldehyde
B acid chloride to aldehyde
C aldehyde to alcohol
D ketone to alkane
Uses poisoned Pd catalyst.
Stephen reaction converts nitrile into
A acid
B aldehyde
C amide
D alcohol
Reduction with SnCl₂/HCl followed by hydrolysis.
Clemmensen reduction is carried out in
A acidic medium
B basic medium
C neutral medium
D alcoholic medium
Zn–Hg/conc. HCl is used.
Wolff–Kishner reduction is carried out in
A acidic medium
B basic medium
C neutral medium
D aqueous medium
Hydrazine and strong base are used.
Which reagent reduces aldehyde to alcohol
A KMnO₄
B NaBH₄
C H₂SO₄
D PCC
Mild reducing agent for carbonyl compounds.
Oxidation of primary alcohol with PCC gives
A acid
B aldehyde
C ketone
D ester
PCC prevents over-oxidation.
Which reaction involves carbocation rearrangement
A SN2
B SN1
C E2
D addition of H₂
Carbocation intermediate allows rearrangement.
Which reagent converts alcohol to alkyl chloride
A NaOH
B SOCl₂
C KOH
D Zn/HCl
Thionyl chloride converts –OH to –Cl.
Lucas test distinguishes alcohols based on
A oxidation
B dehydration
C turbidity due to alkyl chloride formation
D ester formation
Carbocation formation rate differs.
Ozonolysis of alkene gives
A alcohols
B ketones/aldehydes
C acids only
D alkanes
Double bond cleavage occurs.
Which rearrangement involves migration of alkyl group
A Hofmann
B Beckmann
C Pinacol
D Cannizzaro
Alkyl group shifts during rearrangement.
Which reaction forms ether from alcohol
A Williamson synthesis
B Kolbe reaction
C Friedel–Crafts
D Sandmeyer
Alkoxide reacts with alkyl halide.
Williamson synthesis does NOT work well with
A primary halides
B secondary halides
C tertiary halides
D methyl halide
Elimination dominates over substitution.
Which reaction involves free radical mechanism
A SN1
B SN2
C halogenation of alkane
D aldol condensation
Chain reaction with radicals.
Hunsdiecker reaction converts
A acid to alkane
B silver salt of acid to alkyl halide
C acid chloride to acid
D ester to alcohol
Decarboxylative halogenation.
Which reaction shortens carbon chain by one carbon
A aldol
B Cannizzaro
C Hofmann rearrangement
D Friedel–Crafts
Carbonyl carbon is lost.
Which reagent converts nitrobenzene to aniline
A KMnO₄
B Sn/HCl
C PCC
D NaOH
Reduces nitro group to amine.
Baeyer test detects
A alcohol
B alkene
C aldehyde
D ketone
Decolorisation of alkaline KMnO₄.
Which reaction forms cyanohydrin
A addition of HCN to aldehyde
B aldol condensation
C Cannizzaro reaction
D Wurtz reaction
Nucleophilic addition to carbonyl.
Which rearrangement converts ketoxime to amide
A Hofmann
B Beckmann
C Curtius
D Pinacol
Group anti to –OH migrates.
Which reaction involves migration of phenyl group
A Cannizzaro
B Pinacol
C Beckmann
D Aldol
Phenyl migration occurs during rearrangement.
Correct statement is
A Name reactions are not exam-oriented
B Rearrangements always involve carbocations
C Many name reactions are based on simple mechanisms
D All name reactions give single product
Understanding mechanism helps remember reactions.