The electrophile E+ attacks the benzene ring to generate the intermediate σ-complex. Of the following, which σ-complex is of lowest energy?
The oxide that gives H2O2 on treatment with dilute acid is
PbO2
Na2O2
MnO2
TiO2
Which cycloalkane has the lowest heat of combustion per CH2 group?
On mixing a certain alkane with chlorine and irradiating it with ultraviolet light, it forms only one monochloroalkane. This alkane could be
propane
pentane
iso-pentane
neo-pentane
Trans 2-phenyl-1-bromocyclopentane on reaction with alcoholic KOH produces
4-phenylcyclopentene
2- phenylcyclopentene
1 - phenylcyclopentene
3-phenylcyclopentene
Which of the following has the minimum boiling point?
n-butane
1-butyne
1-butene
Iso-butene
One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of 44 u. The alkene is
propene
2-butene
ethene
The treatment of CH3MgX with CH3C ≡ C — H produces
CH3 — CH ≡ CH2
CH3 — C ≡ C —CH3
CH4
Petrol for aviation purposes must contain
Straight chain hydrocarbons
Aromatic hydrocarbons
Olefinic hydrocarbons
Highly branched chain paraffins
Which one of the following processes will produce hard water?
Saturation of water with CaSO4
Saturation of water with CaCO3
Addition of Na2SO4 to water
Saturation of water with MgCO3
