JEE Main & Advanced Sample Paper JEE Main Sample Paper-19

  • question_answer 25) The correct priorities for the substituents shown below, according to the E-Z sequence rule is
    I. \[-CN\]                                
    II. \[-CBr{{(C{{H}_{3}})}_{2}}\]
    III. \[-COOH\]                        
    IV. \[-C{{H}_{2}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-OC{{H}_{3}}\]
    V. \[V-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-H\]

    A)  \[\text{II,III,V,I,IV}\]                       

    B)  \[\text{V,II,I,IV,III}\]

    C)  \[\text{III,IV,I,II,V}\]                    

    D)  \[\text{II,V,I,IV,III}\]

    Correct Answer: A

    Solution :

     (i) \[-\underset{N}{\mathop{\underset{|}{\mathop{\overset{N}{\mathop{\overset{|}{\mathop{C}}\,}}\,}}\,}}\,-\underset{C}{\mathop{\overset{C}{\mathop{\underset{|}{\mathop{\overset{|}{\mathop{N}}\,}}\,}}\,}}\,,\]                      (ii) \[-\underset{Br}{\mathop{\underset{|}{\mathop{\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{C}}\,}}\,}}\,}}\,-C{{H}_{3}},\] (iii) \[-\underset{O}{\mathop{\underset{|}{\mathop{\overset{OH}{\mathop{\overset{|}{\mathop{C}}\,}}\,}}\,}}\,-\underset{C}{\mathop{\underset{|}{\mathop{O}}\,}}\,,\]                           (iv) \[-\underset{H}{\mathop{\underset{|}{\mathop{\overset{H}{\mathop{\overset{|}{\mathop{C}}\,}}\,}}\,}}\,-\underset{O}{\mathop{\underset{|}{\mathop{\overset{O-C}{\mathop{\overset{|}{\mathop{C}}\,}}\,}}\,}}\,-OC{{H}_{3}},\] (v) \[-\overset{O\,}{\mathop{\overset{|}{\mathop{\underset{H}{\mathop{\underset{|}{\mathop{C}}\,}}\,}}\,}}\,\overset{-}{\mathop{-}}\,\overset{C}{\mathop{\overset{|}{\mathop{O}}\,}}\,\] Arrange \[(NNN),\,\,(BrCC),\,\,(OOO),\,(CHH),\,\,(OOH)\] in increasing atomic number. The order is ii, iii, v, i, iv.

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