WorksheetsHYDROCARBONS
Total questions: 11
Worksheet time: 4mins
What is the IUPAC name of CH₃–CH₂–CH=CH₂ ?
1-pentene
1-butene
1-butane
2-butene
Which rule is applied FIRST when naming hydrocarbons?
Identify substituents
Number the carbon chain
Find the longest continuous carbon chain
Name the functional group
Which pair has the same molecular formula but different structural formulas?
Ethane and ethene
Propane and propene
But-1-ene and but-2-ene
Ethene and ethyne
Which molecular formula represents an alkane?
C₄H₈
C₅H₁₀
C₆H₆
C₇H₁₆
The name “2-pentene” shows that:
There are 2 carbon atoms
The double bond starts at carbon 2
The molecule is branched
It is an alkane
What happens when bromine water is added to ethene?
No reaction
The reddish brown colour of bromine remain unchanged
Brown precipitate is formed
The reddish brown colour of bromine decolourised
What is the function of UV during free radical substitution reaction of alkane?
No function
To supply energy for heterolytic cleavage
To make the observation visible and clear
To supply energy for homolytic cleavage
In the initiation step of free radical substitution reaction, halogen molecules undergo heterolytic cleavage.
True
False
Ozonolysis is a reaction used to break the C=C double bond in alkenes.
False
True
Which alkane has the LOWEST boiling point?
Butane
Nonane
Octane
Hexane
Why do straight-chain alkanes have higher boiling points than branched alkanes?
More Carbon atoms
Stronger covalent bonds
Greater surface area for stronger London dispersion forces
Greater polarity
