The quality of diesel is expressed by

• octane number

• cetane number

• antiknock compound

• presence of additives

An alkene having molecular formula, C₆H₁₀ gives  OHC(CH₂)₄CHO, on ozonolysis. The alkene is

• hexene-1

• hexene-2

• cyclohexene

• 1-methylcyclohexene-1

When petroleum is heated gradually, the first batch of vapours evolved will be rich in

• kerosene oil

• diesel oil

• lubricating oil

• petroleum ether

The correct name for the following hydrocarbon is

• tricycle [4.1.0] heptane

• bicyclo [5.2.1] heptane

• bicyclo [4.1.0] heptane

• bicyclo [4.1.0] hexane

475.

The number of isomeric alkanes having the molecular formula C₅H₁₂ is

• Three

• Five

• nine

• Thirty two

Which organic compound is an electrolyte ?

• CH₃Cl

• HCOOH

• CH₃OH

• C₆H₁₂O₆

The petrol, octane number of which is 80, has

• 20% n-heptane + 80% iso-octane

• 20% n-heptane + 80% n-octane

• 80% n-heptane + 20% iso-octane

• 80% n-heptane+ 20% n-octane

An alkyl bromide is formed as the major product on reaction of 3-methyl-2-butene with hydrobromic acid under thermodynamic conditions. Which of the following is the correct IUPAC name of this product?

• 2-bromo-3-methylbutane

• 1-bromo-3-methylbutane

• 2-bromo-2-methylbutane

• 1-bromo-3-methyl-2-butene

Which one of the following represents the major product of the reaction of benzene with 2, 2-dimethylpropyl chloride in presence of anhydrous aluminium chloride?

• 2, 2-dimethylpropylbenzene

• 1, 1-dimethylpropylbenzene

• 1, 2-dimethylpropylbenzene

• 1, 2-dimethyl-1-propenylbenzene

Octane number of petrol can be improved by admixing it with which of the following chemicals?

• Et₄Pb

• CH₃OC(CH₃)₃

• Both (a) and (b)

• Pyrene