Ncert Exercises & Solutions

In which of the following molecule/ion all the bonds are not equal?

1.	${XeF}_{4}$	2.	${BF}_{4}^{-}$
3.	$C_{2} H_{4}$	4.	${SiF}_{4}$

Hint: Sigma bond and pie bond both have a different bond length

Step 1:

Find the type of bonds in the given molecules.

{XeF}_{4} \Rightarrow 4 bp + 2 lp \Rightarrow

square planar

\Rightarrow

all bonds are equal

{BF}_{4}^{-} \Rightarrow 4 bp + 0 lp \Rightarrow

tetrahedral (all bonds are equal)

C_{2} H_{4} \Rightarrow

\Rightarrow C = C

bond is not equal to C-H bond

{SiF}_{4} \Rightarrow 4 bp + 0 lp \Rightarrow

tetrahedral (all bonds are equal)

Step 2:

Hence, in

C_{2} H_{4}

all the bonds are not equal.