Q8 / 160 · AP EAMCET 2021 (24 Aug Shift 2) · Chemistry

According to "molecular orbital theory", which among the following diatomic molecules only has $\pi$-bonds?

  • A
    $\mathrm{N}_2$
  • B
    $\mathrm{H}_2$
  • Correct answer
    C
    $\mathrm{C}_2$
  • D
    $\mathrm{Be}_2$

Solution

Molecular orbital configuration of $\mathrm{C}_2$ is $\sigma l s^2 \sigma * 1 s^2 \sigma 2 s^2 \sigma * 2 s^2 \pi 2 p_x^2=\pi 2 p_y^2$ So, $\mathrm{C}_2$ molecule contains only $\pi$-bonds.

Hence, the correct answer is option: 'C'.

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