" Which of the following is electron-deficient "

Which of the following is an electron-deficient compound?

Which of the following is an electron-deficient compound?

Which of the following is an electron deficient molecule?

Which of the following is an electron deficient compound?

Which of the following is an electron deficient compound?

Which of the following is an electron deficient compound ?

Which of the following is the electron-deficient molecule?

Which of the following is an electron deficient molecule?

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 ?