Chemistry Class 11 NCERT Solutions: Chapter 13 Hydrocarbons Part 6
Q: 7. Propanal and pentan-3-one are the ozonolysis products of an alkene? What is the structural formula of the alkene?
As per the given information, propanal and pentan-3-one are the ozonolysis products of an alkene. Let the given alkene be ‘A’. Writing the reverse of the ozonolysis reaction, we get:
The products are obtained on the cleavage of ozonide ‘X’. Hence, ‘X’ contains both products in the cyclic form. The possible structure of ozonide can be represented as:
Now, ‘X’ is an addition product of alkene ‘A’ with ozone. Therefore, the possible structure of alkene ‘A’ is:
Q: 8. Write Chemical equations for combustion reaction of the following hydrocarbons
Combustion can be defined as a reaction of a compound with oxygen.
Q: 9. Draw the and structures of hex-2-ene. Which isomer will have higher b.p. and why?
Hex-2-ene is represented as:
Geometrical isomers of hex-2-ene are:
The dipole moment of cis-compound is a sum of the dipole moments of and bonds acting in the same direction. The dipole moment of trans-compound is the resultant of the dipole moments of and bonds acting in opposite directions. Hence, cis-isomer is more polar than trans-isomer. The higher the polarity, the greater is the intermolecular dipole-dipole interaction and the higher will be the boiling point. Hence, cis-isomer will have a higher boiling point than trans-isomer.