MCQ
Which of the following is paramagnetic
  • $O_2^ + $
  • B
    $C{N^ - }$
  • C
    $CO$
  • D
    ${N_2}$

Answer

Correct option: A.
$O_2^ + $
(a) $B.O. =$ $\frac{1}{2}[10 - 5] = \frac{5}{2} = 2.5$, paramagnetic

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Which of the following Fridel Craft reaction is incorrectly written.
Calculate the amount of ${(N{H_4})_2}S{O_4}$ in grams which must be added to $500 $ $ml$ of $0.200\,M\,N{H_3}$ to yield a solution with $pH = 9.35$ $({K_b}$ for $N{H_3} = 1.78 \times {10^{ - 5}})$ ........$gm$
In order to complete the reaction $1 - {\text{Pentyne}}\xrightarrow{{\text{a}}}4 - {\text{Octyne}}\xrightarrow{{\text{b}}}cis{\text{ 4 Octene}}$ $a$ and $b$ will be

$(1)$ $NaN{H_2};\mathop {C{H_3}}\limits^{{\text{a}}\,\,\,\,\,\,\,} C{H_2}Br$:${H_2},{\text{ }}\mathop {{\text{(one mole)}}}\limits^{\text{b}} {\text{ }}Pd{\text{ or }}Ni$

$(2)$ $NaN{H_2};C{H_3}C{H_2}C{H_2}Br$:${H_2}{\text{ (two moles) }}Pd{\text{ or }}Ni$

$(3)$ $NaN{H_2};C{H_3}C{H_2}C{H_2}Br$:${H_2},{\text{ (one mole) }}Pd{\text{ or }}Ni$

$(4)$ $NaN{H_2};C{H_3}C{H_2}C{H_2}Br$:$B{H_3},{H_2}{O_2},O{H^ - }$

Which of the following is better nucleophile
The dipole moment of $HBr$ is $1.6 \times {10^{ - 30}}\,cm$ and interatomic spacing is $1\,\mathop A\limits^o $. The $\%$ ionic character of $HBr$ is
A dibromo derivative of an alkane reacts with sodium metal to form an alicyclic hydrocarbon.
The derivative is ___________ .
In which of the following respect, electronic configuration of hydrogen has resemblance to alkali metals and halogens respectively?
According to Le-Chatelier’s principal adding heat to a solid and liquid in equilibrium with endothermic nature will cause the
$Be ( OH )_2$ react with $Sr ( OH )_2$ to yield an ionic salt. Choose the incorrect option related to this reaction from the following:
When the electron of hydrogen atom return to $L$ shell from shells of higher energy, we get a series of lines in the spectrum. This series is called