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JIPMER 2013
Exam
JIPMER
Year
2013
Subject
Chemistry
Chapter
p Block Elements (Group 13 & 14)

JIPMER 2013 · Chemistry · p Block Elements (Group 13 & 14)

Which one of the following statements about C_2 molecule is wrong?

Which one of the following statements about C2\mathrm{C}_2 molecule is wrong?

Options

  1. AThe bond order of C2\mathrm{C}_2 is 2 .
  2. BIn vapour phase, C2\mathrm{C}_2 molecule is diamagnetic.
  3. CDouble bond in C2\mathrm{C}_2 molecule consists of both π\pi - bonds because of the presence of 4es−4 e_s^{-}in two π\pi-molecular orbitals.
  4. Ddouble bond in C2\mathrm{C}_2 molecule consists of one σ\sigma-bond and on π\pi-bond.

Correct answer

D. double bond in C2\mathrm{C}_2 molecule consists of one σ\sigma-bond and on π\pi-bond.

Step-by-step solution

C2(12e−)=σ1s2σ∗1s2,σ2s2,σσ∗2s2(π2px2=π2py2)\begin{aligned} & \mathrm{C}_2\left(12 e^{-}\right)=\sigma 1 s^2 \stackrel{*}{\sigma} 1 s^2, \sigma 2 s^2, \sigma_\sigma^* 2 s^2 \\ &\left(\pi 2 p x_2=\pi 2 p y_2\right)\end{aligned} In C2\mathrm{C}_2 molecule, double bond consists of both π\pi bonds.
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