1

### NEET 2017

Which one of the following pairs of species have the same bond order ?
A
O2, NO+
B
CN$-$, CO
C
N2, O2$-$
D
CO, NO

## Explanation

CN- and CO have same no. of electrons and have same bond order equal to 3.
2
MCQ (More than One Correct Answer)

### NEET 2017

Which of the following pairs of compounds is isostructural ?
A
Tel2, XeF2
B
IBr2$-$, XeF2
C
IF3, XeF2
D
BeCl2, XeF2

## Explanation

Species No. of electrons Structure
TeI2 158 Bent
XeF2 72 Linear
IBr2 124 Linear
XeF2 72 Linear
IF3 80 T-shaped
XeF3 72 Linear
BeCl2 38 Linear
XeF2 72 Linear
3

### NEET 2017

The species, having bond angles of 120o is
A
ClF3
B
NCl3
C
BCl3
D
PH3

## Explanation

BCl3-Trigonal planar, sp2-hybridised, 120o angle
4

### NEET 2016 Phase 1

Consider the molecules CH4, NH3 and H2O.

Which of the given statements is false?
A
The H $-$ O $-$ H bond angle in H2O is smaller than the H $-$ N $-$ H bond angle in NH3.
B
The H $-$ C $-$ H bond angle in CH4 is larger than the H $-$ N $-$ H bond angle in NH3.
C
The H $-$ C $-$ H bond angle in CH4, the H $-$ N $-$ H bond angle in NH3, and the H $-$ O $-$ H bond angle in H2O are all greater than 90o.
D
The H $-$ O $-$ H bond angle in H2O is larger than the H $-$ C $-$ H bond angle in CH4.

## Explanation

In CH4, there is no lone pair of electrons so it is perfectly tetrahedral in shape and has H-C-H bond angle of 109°28′ but in NH3 there is one lone pair which due to more repulsion with bond pairs of electrons pushes them more closer thus bond angle decreases to 107°. In H2O, there are two lone pair of electrons which suppress the bond angle more to 104.5°.