Page 45 - index
P. 45
8. ALIPHATIC HYDROCARBONS eLearn.Punjab
Q. 4. Write the structural formula for each of the following compounds
,
i) 2-Methylpropane. ii) Neopentane.
iii) 3-Ethylpentane. iv) 4-Ethyl-3,4-dimethylheptane.
v) 2,2,3,4-Tetramethylpentane vi) 4-iso-Propylheptane.
vii) 2,2-Dimethylbutane. viii) 2,2-Dimethylpropane.
Q. 5. Write down names of the following compounds according to
IUPAC-system.
( ) ( ))i(
)ii( CH3 C CH2 C CH3 3
3
)iii( )iv( (CH3 ) CH CH CH (CH3 )
2 | 2
CH3
)v( CH3CH2C(CH3 )2CH(CH2CH3 )CH3 )vi( ( CH3CH2 ) CH
3
( ))vii( CH3C(CH3 )2 CH2 2 CH3 )viii( (C6H5 ) CH
3
Q. 6. What are the rules for naming alkanes? Explain with suitable examples.
Q. 7.(a) Write down the structural formulas for all the isomeric hexanes and name
them according to IUPAC system
(b) The following names are incorrect. Give the correct IUPAC names,
i) 4-Methylpentane ii) 3,5,5-Trimethylhexane
iii) 2-Methyl-3-Ethylbutane
Q.8. (a) Explain why alkanes are less reactive than alkenes? What is the effect of
branching on the melting point of alkanes ?
(b) Three different alkanes yield 2-methylbutane when they are hydrogenated
in the presence of a metal catalyst. Give their structures and write equations
for the reactions involved.
45
