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NEET 2020
Exam
NEET
Year
2020
Subject
Chemistry
Chapter
Chemical Bonding and Molecular Structure

NEET 2020 · Chemistry · Chemical Bonding and Molecular Structure

Identify a molecule which does not exist.

Identify a molecule which does not exist.

Options

  1. ALi2{Li}_{2}
  2. BC2{C}_{2}
  3. CO2{O}_{2}
  4. DHe2{He}_{2}

Correct answer

D. He2{He}_{2}

Step-by-step solution

He2={He}_{2} = Total electron =4= 4

=σ1s2σ1s2∗⇒B.O.=12[Nb−Na]=12[2−2]=0= \sigma1{s}^{2}{\sigma}_{1{s}^{2}}^{*} ⇒ B . O . = \dfrac{1}{2} [ Nb - Na ] = \dfrac{1}{2} [ 2 - 2 ] = 0

Bond order =0= 0, so He2{He}_{2} does not exist.

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