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Multiple Choice QuestionsHBr reacts with CH2 = CH – OCH3 under anhydrous conditions at room temperature to give
CH3CHO and CH3Br
BrCH2CHO and CH3OH
BrCH2 – CH2 – OCH3
H3C – CHBr – OCH3
D.
H3C – CHBr – OCH3
Methyl vinyl ether is a very reactive gas. It is hydrolysed rapidly by dilute acids at room temperature to give methanol and aldehyde. However, under anhydrous conditions at room temperature, it undergoes many addition reactions at the double bond.
Electrophilic addition reaction more favourable.
The compound formed on heating chlorobenzene with chloral in the presence concentrated sulphuric acid is
gammexene
hexachloroethane
Freon
Freon
D.
Freon
The IUPAC name of the compound shown below is
2-bromo-6-chlorocyclohex-1-ene
6-bromo-2-chlorocyclohexene
3-bromo-1-chlorocyclohexene
3-bromo-1-chlorocyclohexene
C.
3-bromo-1-chlorocyclohexene
Tertiary alkyl halides are practically inert to substitution by SN2 mechanism because of
insolubility
instability
inductive effect
inductive effect
D.
inductive effect
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Which one of the following has the minimum boiling point?
n-butane
isobutane
1- butene
1- butene
B.
isobutane
Isobutene (H3C)2 - C=CH2 has the minimum force of attraction (due to steric hindrance).Thus minimum boiling point.
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Which of the following will have meso-isomer also?
2- chlorobutane
2- hydroxyopanoic acid
2,3 – dichloropentane
2,3 – dichloropentane
D.
2,3 – dichloropentane
2 methylbutane on reacting with bromine in the presence of sunlight gives mainly
1 – bromo -2 - methylbutane
2 – bromo -2 - methylbutane
2 – bromo -3 - methylbutane
2 – bromo -3 - methylbutane
B.
2 – bromo -2 - methylbutane
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Alkyl halides react with dialkyl copper reagents to give
alkenes
alkyl copper halides
alkanes
alkanes
C.
alkanes
R2CuLi + R'X → R-R' +R-Cu +LiX
Rate of the reaction
is fastest when Z is
Cl
OCOCH3
OC2H5
OC2H5
A.
Cl
Cl- is the best leaving group being the weakest nucleophile out of NH2-, Cl-, -OC2H5 and -OOCCH3.
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