General
✓✗Which of the following undergoes an SN2 reaction fastest?
- (CH3)2CHBr
- CH3CH2Br
- CH3Br
- (CH3)3CBr
General
✓✗Optically active 2-bromobutane gives an optically inactive product when it
- reacts with KCN via SN2
- is reduced with LiAlH4 to butane
- is hydrolysed by aqueous KOH via SN2
- reacts with CH3ONa via SN2
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
✓✗Assertion: Tertiary alkyl halides react mainly by the SN1 mechanism.
Reason: Tertiary carbocations are stabilised by the +I effect and hyperconjugation of the alkyl groups.
Reason: Tertiary carbocations are stabilised by the +I effect and hyperconjugation of the alkyl groups.
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- Assertion is true but Reason is false
- Both Assertion and Reason are false
General
✓✗Chlorobenzene reacts with Cl2 in the presence of anhydrous FeCl3 to give mainly
- 1,4-dichlorobenzene (with some 1,2-dichlorobenzene)
- benzyl chloride
- hexachlorocyclohexane
- 1,3-dichlorobenzene
General
✓✗The IUPAC name of C6H5CH2Cl is
- 1-chloro-4-methylbenzene
- (chloromethyl)benzene
- 1-chloro-2-methylbenzene
- chlorobenzene
General
✓✗Which is the strongest nucleophile towards CH3Br in an SN2 reaction?
- CH3OH
- H2O
- NH4+
- OH−
General
✓✗The number of structural isomers formed on monochlorination of 2-methylbutane is
- 2
- 4
- 5
- 3
General
✓✗The major product formed in the dehydrohalogenation of 2-bromopentane is pent-2-ene. This product formation is based on
- Hofmann rule
- Hund's rule
- Saytzeff (Zaitsev) rule
- Huckel's rule
General
✓✗When butan-1-ol reacts with SOCl2, the number of gaseous by-products formed is
- 2
- 0
- 3
- 1
General
✓✗Dihalides with both halogen atoms on the same carbon atom are called
- aryl dihalides
- geminal (gem-) dihalides
- vicinal (vic-) dihalides
- allylic dihalides
General
✓✗Alkyl halides are reduced to alkanes by
- NaOH
- LiAlH4
- AgNO2
- KCN
General
✓✗Which statement about SN1 reactions is correct?
- They are favoured by polar protic solvents and by tertiary substrates
- They occur with complete inversion of configuration
- Methyl halides react fastest
- Their rate depends on the concentration of the nucleophile
General
✓✗Which of the following reacts fastest with aqueous NaOH?
- Chlorobenzene
- Vinyl chloride
- Benzyl chloride
- 4-Chlorotoluene
General
✓✗Iodoform was used earlier as
- a refrigerant
- an insecticide
- an anaesthetic
- an antiseptic