Which among the following is electron deficient compound?

Which among the following is electron deficient compound?
  1. $\mathrm{SiF}_4$
  2. $\mathrm{BCl}_3$
  3. $\mathrm{PCl}_5$
  4. $\mathrm{CCl}_4$

Asked in: MHT CET 2022 (06 Aug Shift 2)

Practice more p Block Elements (Group 13 & 14) questions on Aicharya