In which of the following processes does the value of bond order and magnetic nature not change?

  • A
    $O_2 \to O_2^+$
  • B
    $N_2^+ \to N_2^-$
  • C
    $NO \to NO^+$
  • D
    $CO \to CO^+$

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Match List-$I$ with List-$II$.
List-$I$ (Molecule) List-$II$ (Number and types of bond/s between two carbon atoms)
$A.$ Ethane $I.$ One $\sigma$-bond and two $\pi$-bonds
$B.$ Ethene $II.$ Two $\pi$-bonds
$C.$ Carbon molecule,$C_2$ $III.$ One $\sigma$-bond
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Choose the correct answer from the options given below:

Which one of the following has no unpaired electrons?

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