Question

11. Among the following the one having longest
chain is
(a) neo-pentane (b) iso-pentane
(c) 2-methylpentane
(d) 2,2-dimethylbutane.​

Answer 1

Answer:

You answer friend ⬇

Explanation:

Among the following the one having longest chan is neo pentane.

Answer 2

The one having the longest chain is option c that is 2-methylpentane.

Explanation:

• The parent chain is made up of the carbon atoms in the longest continuous chain. The parent chain is the one with the most branches if there is more than one chain with the same longest length and so no longest chain exists. Parts of branches are carbon atoms that are joined to the parent chain but are not a part of it. Branch numbers are determined by the carbon number of the parent chain at the location of connection to the parent chain in order to prevent confusion.
• Neo-pentane looks like

                 C$H_{3}$

                    |

    C$H_{3}$  _   C  _  C$H_{3}$

                    |

                  C$H_{3}$

This shows that there are 3 carbon atoms in the parent chain.

• Iso-pentane looks like

                    H

                     |

C$H_{3}$ _ C$H_{2}$ _ C _ C$H_{3}$

                      |

                    C$H_{3}$

This shows that there are 4 carbon atoms in the parent chain.

• 2-methylpentane looks like

 C$H_{3}$  _ C$H_{}$ _ C$H_{2}$ _ C$H_{2}$ _  C$H_{3}$

               |

             C$H_{3}$                

This shows that there are 5 carbon atoms in the parent chain.

• 2,2-dimethylbutane looks like

         C$H_{3}$      

           |

C$H_{3}$ _ C _  C$H_{2}$ _  C$H_{3}$      

           |

          C$H_{3}$      

This shows that there are 4 carbon atoms in the parent chain.

Thus, the one having the longest chain is option c that is

2-methylpentane.

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