Which of the following statements is/are true? 1.$\mathrm{PH}_{5}$ and $\mathrm{BiCl}_{5}$ do not exist. 2.$p \pi-d \pi$ bond is present in $\mathrm{SO}_{2}$ 3.$\mathrm{I}_{3}^{+}$ has bent geometry. 4.$\mathrm{SeF}_{4}$ and $\mathrm{CH}_{4}$, have same shape.

• Correct answer
  A

  1,2,3
• B

  1,3
• C

  1,3,4
• D

  1,2,4

Hence, the correct answer is option: 'A'.