Which one is not a borane ?

Which among the following is not a borane ?

What are boranes ?

What are boranes ?

Boron with hydrogen forms a number of hydrides which are known are boranes. These hydrides are classified into closoboranes and nidobarances. The simplest hydride of boron is diborane. Boron apart from having (2c, 2e) bonds also contain (3c, 2e) bonds. Which of the following is an electron-deficient compound ?

Boron with hydrogen forms a number of hydrides which are known are boranes. These hydrides are classified into closoboranes and nidoboranes. The simplest hydride of boron is diborane. Boron apart from having (2c, 2e) bonds also contain (3c, 2e) bonds. Which of the following is an electron-deficient compound ?