Question

Which One Of The Following Molecule Is Planar?

• A. ${\mathrm{NF}}_3$
• B. ${\mathrm{PH}}_3$
• C. ${\mathrm{BF}}_3$
• D. ${\mathrm{NCl}}_3$

Answer 1

The correct option is C

${\mathrm{BF}}_3$

Explanation for the correct option:

(c ) ${\mathrm{BF}}_3$

• ${\mathrm{BF}}_3$ geometry is planar.
• Its core atom does not have a solitary pair of electrons.
• Thus, this option is correct.

Explanation for the incorrect options:

(a) ${\mathrm{NF}}_3$

• ${\mathrm{NF}}_3$ geometry is trigonal pyramidal.
• Its core atom has a solitary pair of electrons.
• Thus, this option is incorrect.

(b)${\mathrm{PH}}_3$

• ${\mathrm{PH}}_3$ geometry is trigonal pyramidal.
• Its core atom has a solitary pair of electrons.
• Thus, this option is incorrect.

(d) ${\mathrm{NCl}}_3$

• ${\mathrm{NCl}}_3$ geometry is trigonal pyramidal.
• Its core atom has a solitary pair of electrons.
• Thus, this option is incorrect.

Hence the correct option is (c ) ${\mathrm{BF}}_3$