
a.
Interpretation:The compounds C6H12 and C6H6 are to be named and their structures are to be drawn.
Concept Introduction:The carbon compounds are named according to IUPAC convention.
a.

Answer to Problem 5RQ
The compounds C6H12 and C6H6are called cyclohexane and benzene respectively.
Explanation of Solution
The above structures represent C6H12 and C6H6in stick form and they are standard compounds whose names are fixed by the IUPAC convention.
b.
Interpretation:The similarity of the compounds C6H12 and C6H6is to be written.
Concept Introduction:The similarity of the given compounds is primarily their structure.
b.

Answer to Problem 5RQ
The similarity of C6H12 and C6H6is that they are both cyclic compounds with a six carbon primary chain.
Explanation of Solution
Both cyclohexane and benzene have six carbon cyclic chain and both of them are planar so their bond angles and ring structure are also similar.
c.
Interpretation:Thedifferencebetween the compounds C6H12 and C6H6 is to be written.
Concept Introduction:Thedifference of the given compounds lies in their chemical properties.
c.

Answer to Problem 5RQ
C6H12is a saturated cycloalkane and is an aliphatic compound so it gives non sooty flame and has non-pleasant smell. On the other hand, C6H6is an unsaturated compound and is
Explanation of Solution
All the differences between cyclohexane and benzene is due to the resonating pi electron system of benzene which gives the compound its aromatic properties and makes it different from cyclohexane.
d.
Interpretation: Whether C6H12 will react by addition or substitution is to be written.
Concept Introduction: The preference for addition or substitution reactions depends on the presence of pi bonds.
d.

Answer to Problem 5RQ
C6H12prefers to undergo substitution reaction and not addition reaction.
Explanation of Solution
C6H12 is a saturated cycloalkane and all of its carbon atoms are sp3 hybrid with absence of any pi-bonding, therefore it cannot undergo addition reaction and prefers substitution reaction.
Chapter 20 Solutions
World of Chemistry
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