Odd Electron Bond

Q.

Which among the following is an odd electron molecule?

1. $\mathrm{NO}$

2. ${\mathrm{NO}}_2$

3. ${\mathrm{ClO}}_2$

4. all of these

Q. The correct statement(s) regarding diborane $\left(B_2{H}_6\right)$ is/are:

1. Maximum six hydrogen atoms can lie in a plane
2. Maximum six atoms can lie in a plane
3. Bridging $B-H_b$ bond is longer than terminal $B-H_t$ bond
4. Terminal $H_t-B-H_t$ bond angle is greater than bridging $H_b-B-H_b$ bond angle