indicated : (a) C H (one double bond) (b) C H (one triple bond) . Write IUPAC names of the products obtained by the ozonolysis of the following compounds : (i) Pent- -ene (ii) , -Dimethylhept- -ene (iii) -Ethylbut- -ene (iv) -Phenylbut- -ene . An alkene ‘A’ on ozonolysis gives a mixture of ethanal and pentan- -one. Write structure and IUPAC name of ‘A’.
. An alkene ‘A’ contains three C – C, eight C – H σ bonds and one C – C π bond. ‘A’ on ozonolysis gives two moles of an aldehyde of molar mass u. Write IUPAC name of ‘A’.
. Propanal and pentan- -one are the ozonolysis products of an alkene? What is the structural formula of the alkene? .
Write chemical equations for combustion reaction of the following hydrocarbons: (i) Butane (ii) Pentene (iii) Hexyne (iv) Toluene . Draw the cis and trans structures of hex- -ene. Which isomer will have higher b.p. and why?
. Why is benzene extra ordinarily stable though it contains three double bonds? . What are the necessary conditions for any system to be aromatic?
. Explain why the following systems are not aromatic? (i) (ii) (iii) . How will you convert benzene into (i) p -nitrobromobenzene (ii) m - nitrochlorobenzene (iii) p - nitrotoluene (iv) acetophenone?
. In the alkane H C – CH – C(CH ) – CH – CH(CH ) , identify °, °, ° carbon atoms and give the number of H atoms bonded to each one of these. . What effect does branching of an alkane chain has on its boiling point?
. Addition of HBr to propene yields -bromopropane, while in the presence of benzoyl peroxide, the same reaction yields -bromopropane. Explain and give mechanism. .
Write down the products of ozonolysis of , -dimethylbenzene ( o -xylene). How does the result support Kekulé structure for benzene? . Arrange benzene, n -hexane and ethyne in decreasing order of acidic behaviour.
Also give reason for this behaviour. . Why does benzene undergo electrophilic substitution reactions easily and nucleophilic substitutions with difficulty? .