General
✓✗In an SN2 substitution reaction of the type R−Br + Cl− → (DMF) R−Cl + Br−, which one of the following has the highest relative rate?
- CH3CH2CH2Br
- CH3CH2Br
- (CH3)2CHCH2Br
- (CH3)3CCH2Br
General
✓✗The correct order of reactivity towards SN1 of the para-substituted benzyl chlorides is
- benzyl chloride > 4-methoxybenzyl chloride > 4-nitrobenzyl chloride
- 4-nitrobenzyl chloride > benzyl chloride > 4-methoxybenzyl chloride
- 4-methoxybenzyl chloride > benzyl chloride > 4-nitrobenzyl chloride
- all are equal
General
✓✗1-Bromobutane on heating with alcoholic KOH gives
- but-2-ene
- butane
- butan-1-ol
- but-1-ene
General
✓✗The hydrolysis reaction that takes place at the slowest rate, among the following, is
- CH3CH2Cl with aq. NaOH
- C6H5CH2Cl with aq. NaOH
- 2-chlorotoluene (o-CH3C6H4Cl) with aq. NaOH
- CH2=CHCH2Cl with aq. NaOH
General
✓✗CH3CH2Br is classified as a
- secondary (2°) alkyl halide
- tertiary (3°) alkyl halide
- vinylic halide
- primary (1°) alkyl halide
General
✓✗Which is the strongest nucleophile towards CH3Br in an SN2 reaction?
- CH3OH
- H2O
- NH4+
- OH−
General
✓✗Bromine in CCl4 reacts with ethene to give
- bromoethane
- 1,1-dibromoethane
- bromoethene
- 1,2-dibromoethane
General
✓✗Which of the following is least reactive towards aqueous NaOH (nucleophilic aromatic substitution)?
- 1-chloro-2,4-dinitrobenzene
- 1-chloro-3-nitrobenzene
- 1-chloro-4-nitrobenzene
- 1-chloro-2,4,6-trinitrobenzene
General
✓✗For the following reactions:
(A) CH3CH2CH2Br + KOH → CH3CH=CH2 + KBr + H2O
(B) (CH3)2CHBr + KOH → (CH3)2CHOH + KBr
(C) Cyclohexene + Br2 → 1,2-dibromocyclohexane
Which of the following statements is correct?
(A) CH3CH2CH2Br + KOH → CH3CH=CH2 + KBr + H2O
(B) (CH3)2CHBr + KOH → (CH3)2CHOH + KBr
(C) Cyclohexene + Br2 → 1,2-dibromocyclohexane
Which of the following statements is correct?
- (A) is elimination, (B) and (C) are substitution reactions
- (A) is elimination, (B) is substitution and (C) is an addition reaction
- (A) is substitution, (B) and (C) are addition reactions
- (A) and (B) are elimination reactions and (C) is an addition reaction
General
✓✗The Finkelstein reaction converts alkyl chlorides or bromides into alkyl iodides using
- KI in water
- NaI in dry acetone
- HI and ZnCl2
- I2 and red P
General
✓✗m-Dichlorobenzene is named by IUPAC as
- 1,2-dichlorobenzene
- 3,5-dichlorobenzene
- 1,4-dichlorobenzene
- 1,3-dichlorobenzene
General
✓✗Chlorobenzene can be prepared from benzene by
- Cl2 in sunlight without catalyst
- Cl2 in the presence of anhydrous FeCl3
- HCl in water
- NaCl and water
General
✓✗In a vinylic halide, the halogen is bonded to
- an sp3 carbon next to a benzene ring
- an sp carbon
- an sp2 carbon of a C=C double bond
- an sp3 carbon next to a C=C double bond
General
✓✗Haloalkanes are only very slightly soluble in water because
- they are ionic compounds
- they react with water
- the energy released by new attractions with water is less than that needed to break the hydrogen bonds of water
- they are lighter than water
General
✓✗Ethyl bromide reacts with KNO2 to give mainly
- ethanol
- ethyl nitrite
- ethylamine
- nitroethane