JEE Main 2017 · 2 Apr · Shift 1 · Chemistry Q42

ChemistrySingle correct+4 / -1Question 42 of 90

Which of the following species is not paramagnetic ?

\ce{O2}

\ce{B2}

Answer and worked solution

Official answer: D

CO (14 electrons) has all its electrons paired. $\ce{O2}$ and $\ce{B2}$ each have two unpaired π electrons, and NO has one.

JEE Main 2017 · 2 Apr · Shift 1, Chemistry question 42