Q56 / 160 · JIPMER 2007 · Chemistry
Which of the following is the electron deficient molecule?
- Correct answerA$\mathrm{B}_2 \mathrm{H}_6$
- B$\mathrm{C}_2 \mathrm{H}_6$
- C$\mathrm{PH}_3$
- D$\mathrm{SiH}_4$
Solution
$\mathrm{B}_2 \mathrm{H}_6$ is electron deficient molecule because boron atom has three half filled orbitals in excited state. The structure of $\mathrm{B}_2 \mathrm{H}_6$ is represented as follows:
In it two electrons of a $\mathrm{B}-\mathrm{H}$ bond are involved in formation of three centre bond, these bonds are represented as dotted lines.
In it two electrons of a $\mathrm{B}-\mathrm{H}$ bond are involved in formation of three centre bond, these bonds are represented as dotted lines.Hence, the correct answer is option: 'A'.