Question

Question 21 Which of the following is the favorable resonance form(s) of NCS? N= =S :: N—C=S: :n=—5: a and b are both favorable forms only a

Answer 1

EXPLAINATION :

QUESTION 21)-

SOLUTION = The three resonance form of NCS-1 are as following with their formal charges :

  

FC-2

Now we have to look at electronegativity for the “Correct” Lewis structure.The most electronegative atom usually has the negative formal charge, while the least electronegative atom usually has the positive formal charges.

Hence most stable resonance form is :

  
FC: -1 0 :P =C= S: Electronegatvity values: N: 3.0 (-1) C: 2.5 S: 2.5 Is the "correct" Lewis structure out of all the other resonances because of the electronegativity values.

Question 23)

Solution =  Fourth ionization energy come into after removing first three outer core electrons thus the fourth ionization energy will be equal to :   C³⁺(g) = C⁴⁺(g) + e-

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