(a) Giving their structures, state the number of single bonds, double bonds and triple bonds (if any) in the following compounds :
(i) ethyne (ii) ethene (iii) benzene
(b) Write the molecular formula and structure of cyclohexane. How many covalent bonds are there in a molecule of cyclohexane?
(a) Giving their structures, state the number of single bonds, double bonds and triple bonds (if any) in the following compounds :
(i) ethyne (ii) ethene (iii) benzene
(b) Write the molecular formula and structure of cyclohexane. How many covalent bonds are there in a molecule of cyclohexane?
ANSWER:
(a) (i) Structure of ethyne (C2H2) is as follows:
_iii(2).png)
Ethyne has one triple bond between its carbon atoms and two single bonds between its carbon and hydrogen atoms.
(ii) Structure of ethene (C2H4) is as follows:
_ii(3).png)
Ethene has a double bond between its carbon atoms and four single bonds between its carbon and hydrogen atoms.
(iii) Structure of benzene (C6H6) is as follows:
_ii(1).png)
A benzene molecule has three carbon-carbon double bonds, three carbon-carbon single bonds and six carbon-hydrogen single bonds.
(b) The molecular formula of cyclohexane is C6H12.
Its structure is as follows:
_i(2).png)
A cyclohexane molecule has six carbon-carbon single bonds and twelve carbon-hydrogen single bonds. Therefore, there are 18 covalent bonds in one molecule of cyclohexane.
ANSWER:
(a) (i) Structure of ethyne (C2H2) is as follows:
Ethyne has one triple bond between its carbon atoms and two single bonds between its carbon and hydrogen atoms.
(ii) Structure of ethene (C2H4) is as follows:
Ethene has a double bond between its carbon atoms and four single bonds between its carbon and hydrogen atoms.
(iii) Structure of benzene (C6H6) is as follows:
A benzene molecule has three carbon-carbon double bonds, three carbon-carbon single bonds and six carbon-hydrogen single bonds.
(b) The molecular formula of cyclohexane is C6H12.
Its structure is as follows:
A cyclohexane molecule has six carbon-carbon single bonds and twelve carbon-hydrogen single bonds. Therefore, there are 18 covalent bonds in one molecule of cyclohexane.
