Organic Chemistry Multiple Choice Questions and Answers – Cycloalkanes and Cycloalkenes

Questions
1 Cycloalkanes are associated with the general formula called __________
A CnH2n+2
B CnH2(n+2)
C CnH2n+1-r
D CnH2(n+1-r)

Answer: CnH2(n+1-r)
2 Cycloalkanes have the same melting and boiling points as their corresponding alkanes.
A True
B False

Answer: False
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3 Identify the incorrect statement regarding cycloalkanes.
A These have sp3 hybridized carbons
B These have tetrahedral bond angles
C Stability of the cycloalkanes varies directly with their respective size
D These undergo nucleophilic substitution reactions

Answer: These have tetrahedral bond angles
4 Identify the compound with the highest ring strain.
A Cyclomethane
B Cyclopropane
C Cyclobutane
D Cyclopentane

Answer: Cyclopropane
5 Which among the following compounds explodes on contact with oxygen?
A Cyclopropane
B Cyclobutane
C Cyclopentane
D Cyclohexane

Answer: Cyclopropane
6 Identify the incorrect statement regarding cyclobutane.
A The carbon atoms in the cyclobutane are non-coplanar
B These exist in nature as colourless gas
C Cyclobutane is a commercially important compound
D These compounds often show butterfly conformation

Answer: Cyclobutane is a commercially important compound
7 Identify the alicyclic hydrocarbon which is highly flammable.
A Cycloheptane
B Cyclopentane
C Cyclopropane
D Cyclooctane

Answer: Cyclopentane
8 Identify the incorrect statement regarding cyclohexane.
A It is non-polar
B It serves as an organic solvent
C It a hydrophilic hydrocarbon
D It is commercially used for variety of applications

Answer: It a hydrophilic hydrocarbon
9 Identify the incorrect statement regarding cycloalkenes.
A The bonds in them are fewer compared to those in alkenes
B They occur in gaseous form in nature
C These undergo polymerization
D The conjugated double bonds in them increase their stability

Answer: They occur in gaseous form in nature
10 Cycloalkene exhibits aromatic character.
A True
B False

Answer: False

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