Question

Which of the following naming is not given correctly?
(a)- ${{C}_{2}}{{H}_{5}}-O-{{C}_{2}}{{H}_{5}}$ is Diethyl ether
(b)- ${{C}_{6}}{{H}_{5}}-O-{{C}_{6}}{{H}_{5}}$ is Diphenyl ether
(c)- ${{C}_{2}}{{H}_{5}}-O-{{C}_{6}}{{H}_{5}}$ is Ethyl phenyl ether
(d)- ${{C}_{2}}{{H}_{5}}-O-{{C}_{3}}{{H}_{7}}$ is Diethyl propyl ether

Answer 1

Hint: All the compounds given above are ethers and ethers are the group of organic compounds in which there are two carbon chains and these chains are joined by an oxygen atom. And the naming of ethers is done by writing the names of both the carbon chains on either side of the oxygen atom and then ether is written.

Complete answer:
Ethers are a group of organic compounds in which two carbon chains are attached by an oxygen atom and all the compounds given in the options are ethers. The naming of ethers is done by writing the names of both the carbon chains on either side of the oxygen atom and then ether is written, and the name of carbon chains is written alphabetically.
(i)- ${{C}_{2}}{{H}_{5}}-O-{{C}_{2}}{{H}_{5}}$ in these two carbon chains on the oxygen atoms have 2 carbon atoms, i.e., ethyl group. Since both the chains are the same we can use di in the prefix, therefore, its name will be Diethyl ether.
(ii)- ${{C}_{6}}{{H}_{5}}-O-{{C}_{6}}{{H}_{5}}$ in these two carbon chains on the oxygen atoms have 6 cyclic carbon atoms, i.e., a phenyl group. Since both the chains are the same we can use di in the prefix, therefore, its name will be Diphenyl ether.
(iii)- ${{C}_{2}}{{H}_{5}}-O-{{C}_{6}}{{H}_{5}}$ in these two carbon chains on the oxygen atoms have 2 carbon atoms and 6 cyclic carbon atoms, i.e., ethyl and phenyl groups respectively. As e comes before p, its name will be Ethyl phenyl ether.
(iv)- ${{C}_{2}}{{H}_{5}}-O-{{C}_{3}}{{H}_{7}}$ in these two carbon chains on the oxygen atoms have 2 and 3 carbon atoms, i.e., ethyl and propyl groups respectively. As e comes before p, its name will be Ethyl propyl ether.

So, the correct answer is “Option (d)”.

Note:
All the names of the ether given above are common names, but the IUPAC names of the following compounds will be:
${{C}_{2}}{{H}_{5}}-O-{{C}_{2}}{{H}_{5}}$ is Ethoxyethane
${{C}_{6}}{{H}_{5}}-O-{{C}_{6}}{{H}_{5}}$ is Phenoxybenzene
${{C}_{2}}{{H}_{5}}-O-{{C}_{6}}{{H}_{5}}$ is Ethyoxybenzene
${{C}_{2}}{{H}_{5}}-O-{{C}_{3}}{{H}_{7}}$ is Ethoxypropane