Question

Which of the following structure is most stable ?

Choose the correct option.

• A. Only I
• B. Only II
• C. Only III
• D. All three have same stability

Answer 1

Answer: (A)

$I$ is the most stable geometry because both the lone pairs are present at equatorial position. Due to which, repulsion is minimum in molecule as compared to the repulsion in other molecules where lone pair is in axial position.