The electrophile E+ attacks the benzene ring to generate the intermediate σ-complex. Of the following, which σ-complex is of lowest energy?
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
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
Petrol for aviation purposes must contain
Straight chain hydrocarbons
Aromatic hydrocarbons
Olefinic hydrocarbons
Highly branched chain paraffins
Trans 2-phenyl-1-bromocyclopentane on reaction with alcoholic KOH produces
4-phenylcyclopentene
2- phenylcyclopentene
1 - phenylcyclopentene
3-phenylcyclopentene
Which cycloalkane has the lowest heat of combustion per CH2 group?
A hydrocarbon 'A' on ozonolysis gives two isomeric form 'B' and 'C'. B on oxidation gives 'D'. Silver salt of D contains 59.6% Ag. Structure of hydrocarbon is
The treatment of CH3MgX with CH3C ≡ C — H produces
CH3 — CH ≡ CH2
CH3 — C ≡ C —CH3
CH4
Which of the following has the minimum boiling point?
n-butane
1-butyne
1-butene
Iso-butene
Which one is used as propellants for rockets?
Liq.H2 + Liq.O2
Liq.N2 + Liq.O2
Liq.H2 + Liq.N2
Liq.O2 + Liq.air
