New chat PYQ Library Doubts Rank report

Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →

Chemical Bonding and Molecular Structure question

2016 · Shift 1 · Q6

Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.

PYQ Library
JEE Advanced
Chemistry
Chemical Bonding and Molecular Structure
2016 · Shift 1 · Q6

Chemical Bonding and Molecular Structure question

2016 · Shift 1 · Q6

JEE AdvancedChemistryChemical Bonding and Molecular StructureMultiple correct+4 / −2

The compound(s) with TWO lone pairs of electrons on the central atom is(are)

A
$BrF_5$
B
$ClF_3$
C
$XeF_4$
D
$SF_4$

View written solutionFree

Correct answer: B, C

Find the number of lone pairs on the central atom using valence electrons and VSEPR idea.

We check each compound one by one.

Option A: $BrF_5$

Central atom: $Br$
Valence electrons on $Br = 7$
It forms $5$ bonds with $F$ atoms.
Thus, $5$ electron pairs are used in bonding.

Remaining electrons on central atom: $7-5=2 \text{ electrons} = 1 \text{ lone pair}$

So, $BrF_5$ has one lone pair on $Br$ .

❌ Not correct

Option B: $ClF_3$

Central atom: $Cl$
Valence electrons on $Cl = 7$
It forms $3$ bonds with $F$ atoms.

Remaining electrons on central atom: $7-3=4 \text{ electrons} = 2 \text{ lone pairs}$

So, $ClF_3$ has two lone pairs on $Cl$ .

✅ Correct

Option C: $XeF_4$

Central atom: $Xe$
Valence electrons on $Xe = 8$
It forms $4$ bonds with $F$ atoms.

Remaining electrons on central atom: $8-4=4 \text{ electrons} = 2 \text{ lone pairs}$

So, $XeF_4$ has two lone pairs on $Xe$ .

✅ Correct

Option D: $SF_4$

Central atom: $S$
Valence electrons on $S = 6$
It forms $4$ bonds with $F$ atoms.

Remaining electrons on central atom: $6-4=2 \text{ electrons} = 1 \text{ lone pair}$

So, $SF_4$ has one lone pair on $S$ .

❌ Not correct

Final answer

The compounds having two lone pairs on the central atom are: $ClF_3 \text{ and } XeF_4$

So the correct options are B and C.

Comparison with stored correct answer

Stored correct answer: B, C

Our derived answer: B, C

Hence, the answer agrees with the stored correct answer.

More from Chemical Bonding and Molecular Structure

According to Molecular Orbital Theory, which of the following statements is(are) correct?2016 · Multiple correct
Among the triatomic molecules/ions, BeCl $_{2}$ , $N_{3}^{-}$ , N $_{2}$ O, $N O_{2}^{+}$ , O $_{3}$ , SCl $_{2}$ , $I C l_{2}^{-}$ , $I_{3}^{-}$ and XeF $_{2}$ , the total number of linear molecule(s)/ion(s) where the hybridization of the central atom does not have…2015 · Numerical
Hydrogen bonding plays a central role in the following phenomena2014 · Multiple correct
A list of species having the formula $X Z_{4}$ is given below. $X e F_{4}$ , $S F_{4}$ , $S i F_{4}$ , $B F_{4}^{-}$ , $B r F_{4}^{-}$ , $[C u (N H_{3})_{4}]^{2 +}$ , $[F e C l_{4}]^{2 -}$ , $[C o C l_{4}]^{2 -}$ and $[P tC l_{4}]^{2 -}$ Defining shape on the basis of the location of X and Z…2014 · Numerical
Match the orbital overlap figures shown in List I with the description given in List II and select the correct answer using the code given below the lists. Includes diagram2014 · MCQ
Assuming 2s – 2p mixing is NOT operative, the paramagnetic species among the following is2014 · MCQ
The shape of $X e O_{2} F_{2}$ molecule is2012 · MCQ
Based on VSEPR theory, the number of 90 degree F-Br-F angles in $B r F_{5}$ is2010 · Numerical