Component quiz - GCII

Carbonium ions are the intermediates in which the positive charge is carried by the carbon atom with ___________ electrons in the valence shell.

• 5

• 6

• 7

• 8

Inductive effect involvesInductive effect involves

• Displacement of σ electrons resulting in polarisation

• Displacement of π electrons resulting in polarisation

• Delocalisation of σ electrons

• Delocalisation of π electrons

Which of the following is not true about nucleophile?

• donates an electron pair to an electrophile to form a chemical bond

• ) all molecules or ions with a free pair of electrons or at least one pi bond can act as  

      nucleophiles

• nucleophile are Lewis acids by definition

• a nucleophile becomes attracted to a full or partial positive charge

Which reagent is a good nucleophile?

• NH₃

• BH₃

• Br₂

• HBr

Alkanes, Alkenes and Alkynes is the combination of which of the following elements

• Oxygen and Nitrogen 

• Hydrogen and Nitrogen 

• Nitrogen and Carbon

• Carbon and Hydrogen

Cyclopropane when reacted with Bromine it gives

• 1,2-dibromopropane 

• 1,3-dibromopropane 

• 1,4-dibromopropane 

• 1,1-dibromopropane

Which one of the alkali metals form only the normal oxide M₂O on heating in air?

• Rb

• K

• Li

• Na

Which of the following noble gases do not occur in the elemental state in the atmosphere?

• helium

• neon

• argon

• radon

Concentration of sulphide ore is done by

• electrolysis

• roasting

• froth floatation

• gravity separation

Heating ore with carbon in the absence of air is known as:

• reduction

• carbon-reduction 

• smelting

• Roasting