POP QUIZ (HYDROCARBON)

A student tested two unknowns with molecular formula C₆H₁₂ in test tube A and test tube B with bromine in dichloromethane solution. After the experiment, reddish brown colour remains in test tube A but unknown in test tube B decolourise the reddish brown colour of bromine solution. How the result can be interpreted?

• Test test tube B contains C-C

• Test tube A contains cyclic compound

• Test tube B contains C=C

• Unknown A is not a hydrocarbon

What is the major product of this reaction?

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What is the intermediate in this reaction?

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Answer explanation

This is halogenation of alkane. The type of reaction is free radical substitution. So, the reaction intermediate formed is free radical!

Which step in the mechanism of halogenation of alkane that requires light?

• initiation

• propagation

• termination

What are the reagents required for the following reaction?

• H₂O, NaOH

• H^₂O, dilute H₂SO₄

• Br₂, H₂O

What is the major product of the following reaction?

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What is the product of the Br₂ addition to methycyclohexene?

• 1-bromo-1methylcyclohexane

• 1,2-dibromo-1-methylcyclohexene

• 1,2-dibromo-1-methylcyclohexane

Suggest the structure of the reactant.

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What is the name of this chemical test?

• Ozonolysis test

• Baeyer's test

• Bromine test

• Alcoholysis

Choose the CORRECT statement for boiling point of alkane.

• boiling point increase with the number of carbon atoms in the chain

• boiling point increase with branching

• boiling point decrease with the number of carbon atoms in the chain

• boiling point are determined by the hydrogen bonding