Which of the following is electron-deficient :
(1) PH3 (2) (CH3)2 (3) (SiH3)2 (4) (BH3)2
Answers
(BH3)2 is electron deficient among all of these due to the following reasons:
- Boron(B) is the element belongs to 13 group , Si and C (silicon and carbon) belongs to group 14 whereas phosphorus (P) is the element that belongs to group 15.
- Elements of group 15 are considered as Electron rich elements as they have excess electrons then the electrons required for bonding to complete an octet. So, (PH3)2 hydride is an electron rich compound.
- Electrons of group 14 are considered as Electron precise elements as they have same number of electrons that are required for bonding. Thus , complete the octet.
- So, (SiH3)2 , (CH3)2 are known as electron precise compounds of hydrogen .
- Electrons of group 13 are considered as Electron deficient elements because they have less number of electrons as compared to the electrons required for bonding. So, (BH3)2 is unable to complete the octet when dimerises it has only 6 electrons.
-Thus, (BH3)2 is an electron deficient element.
Explanation:
I hope its helpful to u mate
