QBManager

CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313752 Match the species in Column I with the bond order in Column II and choose the correct option from the codes given below:
Column I
Column II
A
\({\rm{NO}}\)
P
1.5
B
\({\rm{CO}}\)
Q
2.0
C
\({\rm{O}}_{\rm{2}}^{\rm{ - }}\)
R
2.5
D
\({{\rm{O}}_{\rm{2}}}\)
S
3.0

1 A - Q, B - P, C - S, D - R

2 A - P, B - Q, C - R, D - S

3 A - Q, B - S, C - P, D - Q

4 A - R, B - S, C - P, D - Q

Explanation:

A-Q, B-S, C-P, D-Q
A. \({\rm{NO}}\left( {{\rm{7 + 8 = 15}}} \right){\rm{ = \sigma 1}}{{\rm{s}}^{\rm{2}}}{\rm{,}}\,{{\rm{\sigma }}^{\rm{*}}}{\rm{1}}{{\rm{s}}^{\rm{2}}}{\rm{;}}\,{\rm{\sigma 2}}{{\rm{s}}^{\rm{2}}}{\rm{;}}{{\rm{\sigma }}^{\rm{*}}}{\rm{2}}{{\rm{s}}^{\rm{2}}}\),
\({\rm{\sigma 2p}}_{\rm{z}}^{\rm{2}}{\rm{,}}{\mkern 1mu} {\rm{\pi 2p}}_{\rm{x}}^{\rm{2}}{\mkern 1mu} \approx {\mkern 1mu} {\rm{\pi 2p}}_{\rm{y}}^{\rm{2}}{\rm{,}}{\mkern 1mu} {{\rm{\pi }}^{\rm{*}}}{\rm{2p}}_{\rm{x}}^{\rm{2}}\)
\({\rm{Bond}}\,\,{\rm{order = }}\frac{{\rm{1}}}{{\rm{2}}}\left( {{{\rm{N}}_{\rm{b}}}{\rm{ - }}{{\rm{N}}_{\rm{a}}}} \right){\rm{ = }}\frac{{{\rm{10 - 5}}}}{{\rm{2}}}{\rm{ = 2}}{\rm{.5}}\)
B. \({\rm{CO}}\left( {{\rm{6 + 8 = 14}}} \right){\rm{ = \sigma 1}}{{\rm{s}}^{\rm{2}}}{\rm{,}}{\mkern 1mu} {{\rm{\sigma }}^{\rm{*}}}{\rm{1}}{{\rm{s}}^{\rm{2}}}{\rm{,\sigma 2}}{{\rm{s}}^{\rm{2}}}{\rm{,}}{{\rm{\sigma }}^{\rm{*}}}{\rm{2}}{{\rm{s}}^{\rm{2}}}\)
\({\rm{\sigma 2p}}_{\rm{z}}^{\rm{2}}{\rm{,}}{\mkern 1mu} {\rm{\pi 2p}}_{\rm{x}}^{\rm{2}}{\mkern 1mu} \approx {\mkern 1mu} {{\rm{\pi }}^{\rm{*}}}{\rm{2p}}_{\rm{y}}^{\rm{2}}\)
\({\rm{Bond}}\,\,{\rm{order = }}\frac{{{\rm{10 - 4}}}}{{\rm{2}}}{\rm{ = 3}}{\rm{.0}}\)
C. \({\rm{O}}_{\rm{2}}^{\rm{ - }}\left( {{\rm{8 + 8 + 1 = 17}}} \right){\rm{ = \sigma 1}}{{\rm{s}}^{\rm{2}}}{\rm{,}}{\mkern 1mu} {{\rm{\sigma }}^{\rm{*}}}{\rm{1}}{{\rm{s}}^{\rm{2}}}{\rm{,\sigma 2}}{{\rm{s}}^{\rm{2}}}{\rm{,}}{{\rm{\sigma }}^{\rm{*}}}{\rm{2}}{{\rm{s}}^{\rm{2}}}\)
\({\rm{\sigma 2p}}_{\rm{z}}^{\rm{2}}{\rm{,}}\,{\rm{\pi 2p}}_{\rm{x}}^{\rm{2}}\,{\rm{ = }}\,{\rm{\pi 2p}}_{\rm{y}}^{\rm{2}}{\rm{,}}{{\rm{\pi }}^{\rm{*}}}{\rm{2p}}_{\rm{x}}^{\rm{2}}{\rm{ = }}{{\rm{\pi }}^{\rm{*}}}{\rm{2p}}_{\rm{x}}^{\rm{1}}\)
\({\rm{Bond}}{\mkern 1mu} {\mkern 1mu} {\rm{order = }}\frac{{{\rm{10 - 7}}}}{{\rm{2}}}{\rm{ = 1}}{\rm{.5}}\)
D. \({{\rm{O}}_{\rm{2}}}\left( {{\rm{8 + 8 = 16}}} \right){\rm{ = \sigma 1}}{{\rm{s}}^{\rm{2}}}{\rm{,}}{\mkern 1mu} {{\rm{\sigma }}^{\rm{*}}}{\rm{1}}{{\rm{s}}^{\rm{2}}}{\rm{,\sigma 2}}{{\rm{s}}^{\rm{2}}}{\rm{,}}{{\rm{\sigma }}^{\rm{*}}}{\rm{2}}{{\rm{s}}^{\rm{2}}}{\rm{,\sigma 2p}}_{\rm{z}}^{\rm{2}}\)
\({\rm{\pi 2p}}_{\rm{y}}^{\rm{2}}{\rm{,}}{{\rm{\pi }}^{\rm{*}}}{\rm{2p}}_{\rm{x}}^{\rm{1}} \simeq {{\rm{\pi }}^{\rm{*}}}{\rm{2p}}_{\rm{y}}^{\rm{1}}\)
\({\rm{Bond}}\,\,{\rm{order = }}\frac{{{\rm{10 - 6}}}}{{\rm{2}}}{\rm{ = 2}}{\rm{.0}}\)
So, the option (4) is correct.

CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313753 Which of the following is paramagnetic?

1 \({\rm{N}}{{\rm{O}}^{\rm{ + }}}\)

2 \({\rm{CO}}\)

3 \({\rm{O}}_{\rm{2}}^{{\rm{2 - }}}\)

4 \({{\rm{B}}_{\rm{2}}}\)

JEE - 2017

CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313754 How many of the following species have bond order of 2.5 ?
\[\begin{array}{*{20}{l}}
{{\rm{(i)}}{{\rm{N}}_{\rm{2}}}^ \oplus {\mkern 1mu} {\mkern 1mu} {\rm{(ii)}}{{\rm{N}}_{\rm{2}}}^ \ominus {\rm{(iii)}}{{\rm{O}}_{\rm{2}}}^ \oplus {\rm{(iv)O}}_{\rm{2}}^ \ominus }\\
{{\rm{(v)NO}}{\mkern 1mu} {\mkern 1mu} {\rm{(vi)CN}}}
\end{array}\]

1 6

2 5

3 4

4 3

CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313755 Which of the following statement is not correct from the view point molecular orbital theory?

1 \(\mathrm{Be}_{2}\) is not a stable molecule

2 \(\mathrm{He}_{2}\) is not stable but \(\mathrm{He}_{2}^{+}\)is expected to exist

3 Bond strength of \(\mathrm{N}_{2}\) is maximum amongst the homonuclear diatomic molecules belonging to the second period

4 The order of energies of molecular orbitals in \(\mathrm{N}_{2}\) molecule is

CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313752 Match the species in Column I with the bond order in Column II and choose the correct option from the codes given below:
Column I
Column II
A
\({\rm{NO}}\)
P
1.5
B
\({\rm{CO}}\)
Q
2.0
C
\({\rm{O}}_{\rm{2}}^{\rm{ - }}\)
R
2.5
D
\({{\rm{O}}_{\rm{2}}}\)
S
3.0

1 A - Q, B - P, C - S, D - R

2 A - P, B - Q, C - R, D - S

3 A - Q, B - S, C - P, D - Q

4 A - R, B - S, C - P, D - Q

Explanation:

A-Q, B-S, C-P, D-Q
A. \({\rm{NO}}\left( {{\rm{7 + 8 = 15}}} \right){\rm{ = \sigma 1}}{{\rm{s}}^{\rm{2}}}{\rm{,}}\,{{\rm{\sigma }}^{\rm{*}}}{\rm{1}}{{\rm{s}}^{\rm{2}}}{\rm{;}}\,{\rm{\sigma 2}}{{\rm{s}}^{\rm{2}}}{\rm{;}}{{\rm{\sigma }}^{\rm{*}}}{\rm{2}}{{\rm{s}}^{\rm{2}}}\),
\({\rm{\sigma 2p}}_{\rm{z}}^{\rm{2}}{\rm{,}}{\mkern 1mu} {\rm{\pi 2p}}_{\rm{x}}^{\rm{2}}{\mkern 1mu} \approx {\mkern 1mu} {\rm{\pi 2p}}_{\rm{y}}^{\rm{2}}{\rm{,}}{\mkern 1mu} {{\rm{\pi }}^{\rm{*}}}{\rm{2p}}_{\rm{x}}^{\rm{2}}\)
\({\rm{Bond}}\,\,{\rm{order = }}\frac{{\rm{1}}}{{\rm{2}}}\left( {{{\rm{N}}_{\rm{b}}}{\rm{ - }}{{\rm{N}}_{\rm{a}}}} \right){\rm{ = }}\frac{{{\rm{10 - 5}}}}{{\rm{2}}}{\rm{ = 2}}{\rm{.5}}\)
B. \({\rm{CO}}\left( {{\rm{6 + 8 = 14}}} \right){\rm{ = \sigma 1}}{{\rm{s}}^{\rm{2}}}{\rm{,}}{\mkern 1mu} {{\rm{\sigma }}^{\rm{*}}}{\rm{1}}{{\rm{s}}^{\rm{2}}}{\rm{,\sigma 2}}{{\rm{s}}^{\rm{2}}}{\rm{,}}{{\rm{\sigma }}^{\rm{*}}}{\rm{2}}{{\rm{s}}^{\rm{2}}}\)
\({\rm{\sigma 2p}}_{\rm{z}}^{\rm{2}}{\rm{,}}{\mkern 1mu} {\rm{\pi 2p}}_{\rm{x}}^{\rm{2}}{\mkern 1mu} \approx {\mkern 1mu} {{\rm{\pi }}^{\rm{*}}}{\rm{2p}}_{\rm{y}}^{\rm{2}}\)
\({\rm{Bond}}\,\,{\rm{order = }}\frac{{{\rm{10 - 4}}}}{{\rm{2}}}{\rm{ = 3}}{\rm{.0}}\)
C. \({\rm{O}}_{\rm{2}}^{\rm{ - }}\left( {{\rm{8 + 8 + 1 = 17}}} \right){\rm{ = \sigma 1}}{{\rm{s}}^{\rm{2}}}{\rm{,}}{\mkern 1mu} {{\rm{\sigma }}^{\rm{*}}}{\rm{1}}{{\rm{s}}^{\rm{2}}}{\rm{,\sigma 2}}{{\rm{s}}^{\rm{2}}}{\rm{,}}{{\rm{\sigma }}^{\rm{*}}}{\rm{2}}{{\rm{s}}^{\rm{2}}}\)
\({\rm{\sigma 2p}}_{\rm{z}}^{\rm{2}}{\rm{,}}\,{\rm{\pi 2p}}_{\rm{x}}^{\rm{2}}\,{\rm{ = }}\,{\rm{\pi 2p}}_{\rm{y}}^{\rm{2}}{\rm{,}}{{\rm{\pi }}^{\rm{*}}}{\rm{2p}}_{\rm{x}}^{\rm{2}}{\rm{ = }}{{\rm{\pi }}^{\rm{*}}}{\rm{2p}}_{\rm{x}}^{\rm{1}}\)
\({\rm{Bond}}{\mkern 1mu} {\mkern 1mu} {\rm{order = }}\frac{{{\rm{10 - 7}}}}{{\rm{2}}}{\rm{ = 1}}{\rm{.5}}\)
D. \({{\rm{O}}_{\rm{2}}}\left( {{\rm{8 + 8 = 16}}} \right){\rm{ = \sigma 1}}{{\rm{s}}^{\rm{2}}}{\rm{,}}{\mkern 1mu} {{\rm{\sigma }}^{\rm{*}}}{\rm{1}}{{\rm{s}}^{\rm{2}}}{\rm{,\sigma 2}}{{\rm{s}}^{\rm{2}}}{\rm{,}}{{\rm{\sigma }}^{\rm{*}}}{\rm{2}}{{\rm{s}}^{\rm{2}}}{\rm{,\sigma 2p}}_{\rm{z}}^{\rm{2}}\)
\({\rm{\pi 2p}}_{\rm{y}}^{\rm{2}}{\rm{,}}{{\rm{\pi }}^{\rm{*}}}{\rm{2p}}_{\rm{x}}^{\rm{1}} \simeq {{\rm{\pi }}^{\rm{*}}}{\rm{2p}}_{\rm{y}}^{\rm{1}}\)
\({\rm{Bond}}\,\,{\rm{order = }}\frac{{{\rm{10 - 6}}}}{{\rm{2}}}{\rm{ = 2}}{\rm{.0}}\)
So, the option (4) is correct.

CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313753 Which of the following is paramagnetic?

1 \({\rm{N}}{{\rm{O}}^{\rm{ + }}}\)

2 \({\rm{CO}}\)

3 \({\rm{O}}_{\rm{2}}^{{\rm{2 - }}}\)

4 \({{\rm{B}}_{\rm{2}}}\)

JEE - 2017

CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313754 How many of the following species have bond order of 2.5 ?
\[\begin{array}{*{20}{l}}
{{\rm{(i)}}{{\rm{N}}_{\rm{2}}}^ \oplus {\mkern 1mu} {\mkern 1mu} {\rm{(ii)}}{{\rm{N}}_{\rm{2}}}^ \ominus {\rm{(iii)}}{{\rm{O}}_{\rm{2}}}^ \oplus {\rm{(iv)O}}_{\rm{2}}^ \ominus }\\
{{\rm{(v)NO}}{\mkern 1mu} {\mkern 1mu} {\rm{(vi)CN}}}
\end{array}\]

1 6

2 5

3 4

4 3

CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313755 Which of the following statement is not correct from the view point molecular orbital theory?

1 \(\mathrm{Be}_{2}\) is not a stable molecule

2 \(\mathrm{He}_{2}\) is not stable but \(\mathrm{He}_{2}^{+}\)is expected to exist

3 Bond strength of \(\mathrm{N}_{2}\) is maximum amongst the homonuclear diatomic molecules belonging to the second period

4 The order of energies of molecular orbitals in \(\mathrm{N}_{2}\) molecule is

CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313752 Match the species in Column I with the bond order in Column II and choose the correct option from the codes given below:
Column I
Column II
A
\({\rm{NO}}\)
P
1.5
B
\({\rm{CO}}\)
Q
2.0
C
\({\rm{O}}_{\rm{2}}^{\rm{ - }}\)
R
2.5
D
\({{\rm{O}}_{\rm{2}}}\)
S
3.0

1 A - Q, B - P, C - S, D - R

2 A - P, B - Q, C - R, D - S

3 A - Q, B - S, C - P, D - Q

4 A - R, B - S, C - P, D - Q

Explanation:

A-Q, B-S, C-P, D-Q
A. \({\rm{NO}}\left( {{\rm{7 + 8 = 15}}} \right){\rm{ = \sigma 1}}{{\rm{s}}^{\rm{2}}}{\rm{,}}\,{{\rm{\sigma }}^{\rm{*}}}{\rm{1}}{{\rm{s}}^{\rm{2}}}{\rm{;}}\,{\rm{\sigma 2}}{{\rm{s}}^{\rm{2}}}{\rm{;}}{{\rm{\sigma }}^{\rm{*}}}{\rm{2}}{{\rm{s}}^{\rm{2}}}\),
\({\rm{\sigma 2p}}_{\rm{z}}^{\rm{2}}{\rm{,}}{\mkern 1mu} {\rm{\pi 2p}}_{\rm{x}}^{\rm{2}}{\mkern 1mu} \approx {\mkern 1mu} {\rm{\pi 2p}}_{\rm{y}}^{\rm{2}}{\rm{,}}{\mkern 1mu} {{\rm{\pi }}^{\rm{*}}}{\rm{2p}}_{\rm{x}}^{\rm{2}}\)
\({\rm{Bond}}\,\,{\rm{order = }}\frac{{\rm{1}}}{{\rm{2}}}\left( {{{\rm{N}}_{\rm{b}}}{\rm{ - }}{{\rm{N}}_{\rm{a}}}} \right){\rm{ = }}\frac{{{\rm{10 - 5}}}}{{\rm{2}}}{\rm{ = 2}}{\rm{.5}}\)
B. \({\rm{CO}}\left( {{\rm{6 + 8 = 14}}} \right){\rm{ = \sigma 1}}{{\rm{s}}^{\rm{2}}}{\rm{,}}{\mkern 1mu} {{\rm{\sigma }}^{\rm{*}}}{\rm{1}}{{\rm{s}}^{\rm{2}}}{\rm{,\sigma 2}}{{\rm{s}}^{\rm{2}}}{\rm{,}}{{\rm{\sigma }}^{\rm{*}}}{\rm{2}}{{\rm{s}}^{\rm{2}}}\)
\({\rm{\sigma 2p}}_{\rm{z}}^{\rm{2}}{\rm{,}}{\mkern 1mu} {\rm{\pi 2p}}_{\rm{x}}^{\rm{2}}{\mkern 1mu} \approx {\mkern 1mu} {{\rm{\pi }}^{\rm{*}}}{\rm{2p}}_{\rm{y}}^{\rm{2}}\)
\({\rm{Bond}}\,\,{\rm{order = }}\frac{{{\rm{10 - 4}}}}{{\rm{2}}}{\rm{ = 3}}{\rm{.0}}\)
C. \({\rm{O}}_{\rm{2}}^{\rm{ - }}\left( {{\rm{8 + 8 + 1 = 17}}} \right){\rm{ = \sigma 1}}{{\rm{s}}^{\rm{2}}}{\rm{,}}{\mkern 1mu} {{\rm{\sigma }}^{\rm{*}}}{\rm{1}}{{\rm{s}}^{\rm{2}}}{\rm{,\sigma 2}}{{\rm{s}}^{\rm{2}}}{\rm{,}}{{\rm{\sigma }}^{\rm{*}}}{\rm{2}}{{\rm{s}}^{\rm{2}}}\)
\({\rm{\sigma 2p}}_{\rm{z}}^{\rm{2}}{\rm{,}}\,{\rm{\pi 2p}}_{\rm{x}}^{\rm{2}}\,{\rm{ = }}\,{\rm{\pi 2p}}_{\rm{y}}^{\rm{2}}{\rm{,}}{{\rm{\pi }}^{\rm{*}}}{\rm{2p}}_{\rm{x}}^{\rm{2}}{\rm{ = }}{{\rm{\pi }}^{\rm{*}}}{\rm{2p}}_{\rm{x}}^{\rm{1}}\)
\({\rm{Bond}}{\mkern 1mu} {\mkern 1mu} {\rm{order = }}\frac{{{\rm{10 - 7}}}}{{\rm{2}}}{\rm{ = 1}}{\rm{.5}}\)
D. \({{\rm{O}}_{\rm{2}}}\left( {{\rm{8 + 8 = 16}}} \right){\rm{ = \sigma 1}}{{\rm{s}}^{\rm{2}}}{\rm{,}}{\mkern 1mu} {{\rm{\sigma }}^{\rm{*}}}{\rm{1}}{{\rm{s}}^{\rm{2}}}{\rm{,\sigma 2}}{{\rm{s}}^{\rm{2}}}{\rm{,}}{{\rm{\sigma }}^{\rm{*}}}{\rm{2}}{{\rm{s}}^{\rm{2}}}{\rm{,\sigma 2p}}_{\rm{z}}^{\rm{2}}\)
\({\rm{\pi 2p}}_{\rm{y}}^{\rm{2}}{\rm{,}}{{\rm{\pi }}^{\rm{*}}}{\rm{2p}}_{\rm{x}}^{\rm{1}} \simeq {{\rm{\pi }}^{\rm{*}}}{\rm{2p}}_{\rm{y}}^{\rm{1}}\)
\({\rm{Bond}}\,\,{\rm{order = }}\frac{{{\rm{10 - 6}}}}{{\rm{2}}}{\rm{ = 2}}{\rm{.0}}\)
So, the option (4) is correct.

CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313753 Which of the following is paramagnetic?

1 \({\rm{N}}{{\rm{O}}^{\rm{ + }}}\)

2 \({\rm{CO}}\)

3 \({\rm{O}}_{\rm{2}}^{{\rm{2 - }}}\)

4 \({{\rm{B}}_{\rm{2}}}\)

JEE - 2017

CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313754 How many of the following species have bond order of 2.5 ?
\[\begin{array}{*{20}{l}}
{{\rm{(i)}}{{\rm{N}}_{\rm{2}}}^ \oplus {\mkern 1mu} {\mkern 1mu} {\rm{(ii)}}{{\rm{N}}_{\rm{2}}}^ \ominus {\rm{(iii)}}{{\rm{O}}_{\rm{2}}}^ \oplus {\rm{(iv)O}}_{\rm{2}}^ \ominus }\\
{{\rm{(v)NO}}{\mkern 1mu} {\mkern 1mu} {\rm{(vi)CN}}}
\end{array}\]

1 6

2 5

3 4

4 3

CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313755 Which of the following statement is not correct from the view point molecular orbital theory?

1 \(\mathrm{Be}_{2}\) is not a stable molecule

2 \(\mathrm{He}_{2}\) is not stable but \(\mathrm{He}_{2}^{+}\)is expected to exist

3 Bond strength of \(\mathrm{N}_{2}\) is maximum amongst the homonuclear diatomic molecules belonging to the second period

4 The order of energies of molecular orbitals in \(\mathrm{N}_{2}\) molecule is

CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313752 Match the species in Column I with the bond order in Column II and choose the correct option from the codes given below:
Column I
Column II
A
\({\rm{NO}}\)
P
1.5
B
\({\rm{CO}}\)
Q
2.0
C
\({\rm{O}}_{\rm{2}}^{\rm{ - }}\)
R
2.5
D
\({{\rm{O}}_{\rm{2}}}\)
S
3.0

1 A - Q, B - P, C - S, D - R

2 A - P, B - Q, C - R, D - S

3 A - Q, B - S, C - P, D - Q

4 A - R, B - S, C - P, D - Q

Explanation:

A-Q, B-S, C-P, D-Q
A. \({\rm{NO}}\left( {{\rm{7 + 8 = 15}}} \right){\rm{ = \sigma 1}}{{\rm{s}}^{\rm{2}}}{\rm{,}}\,{{\rm{\sigma }}^{\rm{*}}}{\rm{1}}{{\rm{s}}^{\rm{2}}}{\rm{;}}\,{\rm{\sigma 2}}{{\rm{s}}^{\rm{2}}}{\rm{;}}{{\rm{\sigma }}^{\rm{*}}}{\rm{2}}{{\rm{s}}^{\rm{2}}}\),
\({\rm{\sigma 2p}}_{\rm{z}}^{\rm{2}}{\rm{,}}{\mkern 1mu} {\rm{\pi 2p}}_{\rm{x}}^{\rm{2}}{\mkern 1mu} \approx {\mkern 1mu} {\rm{\pi 2p}}_{\rm{y}}^{\rm{2}}{\rm{,}}{\mkern 1mu} {{\rm{\pi }}^{\rm{*}}}{\rm{2p}}_{\rm{x}}^{\rm{2}}\)
\({\rm{Bond}}\,\,{\rm{order = }}\frac{{\rm{1}}}{{\rm{2}}}\left( {{{\rm{N}}_{\rm{b}}}{\rm{ - }}{{\rm{N}}_{\rm{a}}}} \right){\rm{ = }}\frac{{{\rm{10 - 5}}}}{{\rm{2}}}{\rm{ = 2}}{\rm{.5}}\)
B. \({\rm{CO}}\left( {{\rm{6 + 8 = 14}}} \right){\rm{ = \sigma 1}}{{\rm{s}}^{\rm{2}}}{\rm{,}}{\mkern 1mu} {{\rm{\sigma }}^{\rm{*}}}{\rm{1}}{{\rm{s}}^{\rm{2}}}{\rm{,\sigma 2}}{{\rm{s}}^{\rm{2}}}{\rm{,}}{{\rm{\sigma }}^{\rm{*}}}{\rm{2}}{{\rm{s}}^{\rm{2}}}\)
\({\rm{\sigma 2p}}_{\rm{z}}^{\rm{2}}{\rm{,}}{\mkern 1mu} {\rm{\pi 2p}}_{\rm{x}}^{\rm{2}}{\mkern 1mu} \approx {\mkern 1mu} {{\rm{\pi }}^{\rm{*}}}{\rm{2p}}_{\rm{y}}^{\rm{2}}\)
\({\rm{Bond}}\,\,{\rm{order = }}\frac{{{\rm{10 - 4}}}}{{\rm{2}}}{\rm{ = 3}}{\rm{.0}}\)
C. \({\rm{O}}_{\rm{2}}^{\rm{ - }}\left( {{\rm{8 + 8 + 1 = 17}}} \right){\rm{ = \sigma 1}}{{\rm{s}}^{\rm{2}}}{\rm{,}}{\mkern 1mu} {{\rm{\sigma }}^{\rm{*}}}{\rm{1}}{{\rm{s}}^{\rm{2}}}{\rm{,\sigma 2}}{{\rm{s}}^{\rm{2}}}{\rm{,}}{{\rm{\sigma }}^{\rm{*}}}{\rm{2}}{{\rm{s}}^{\rm{2}}}\)
\({\rm{\sigma 2p}}_{\rm{z}}^{\rm{2}}{\rm{,}}\,{\rm{\pi 2p}}_{\rm{x}}^{\rm{2}}\,{\rm{ = }}\,{\rm{\pi 2p}}_{\rm{y}}^{\rm{2}}{\rm{,}}{{\rm{\pi }}^{\rm{*}}}{\rm{2p}}_{\rm{x}}^{\rm{2}}{\rm{ = }}{{\rm{\pi }}^{\rm{*}}}{\rm{2p}}_{\rm{x}}^{\rm{1}}\)
\({\rm{Bond}}{\mkern 1mu} {\mkern 1mu} {\rm{order = }}\frac{{{\rm{10 - 7}}}}{{\rm{2}}}{\rm{ = 1}}{\rm{.5}}\)
D. \({{\rm{O}}_{\rm{2}}}\left( {{\rm{8 + 8 = 16}}} \right){\rm{ = \sigma 1}}{{\rm{s}}^{\rm{2}}}{\rm{,}}{\mkern 1mu} {{\rm{\sigma }}^{\rm{*}}}{\rm{1}}{{\rm{s}}^{\rm{2}}}{\rm{,\sigma 2}}{{\rm{s}}^{\rm{2}}}{\rm{,}}{{\rm{\sigma }}^{\rm{*}}}{\rm{2}}{{\rm{s}}^{\rm{2}}}{\rm{,\sigma 2p}}_{\rm{z}}^{\rm{2}}\)
\({\rm{\pi 2p}}_{\rm{y}}^{\rm{2}}{\rm{,}}{{\rm{\pi }}^{\rm{*}}}{\rm{2p}}_{\rm{x}}^{\rm{1}} \simeq {{\rm{\pi }}^{\rm{*}}}{\rm{2p}}_{\rm{y}}^{\rm{1}}\)
\({\rm{Bond}}\,\,{\rm{order = }}\frac{{{\rm{10 - 6}}}}{{\rm{2}}}{\rm{ = 2}}{\rm{.0}}\)
So, the option (4) is correct.

CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313753 Which of the following is paramagnetic?

1 \({\rm{N}}{{\rm{O}}^{\rm{ + }}}\)

2 \({\rm{CO}}\)

3 \({\rm{O}}_{\rm{2}}^{{\rm{2 - }}}\)

4 \({{\rm{B}}_{\rm{2}}}\)

JEE - 2017

CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313754 How many of the following species have bond order of 2.5 ?
\[\begin{array}{*{20}{l}}
{{\rm{(i)}}{{\rm{N}}_{\rm{2}}}^ \oplus {\mkern 1mu} {\mkern 1mu} {\rm{(ii)}}{{\rm{N}}_{\rm{2}}}^ \ominus {\rm{(iii)}}{{\rm{O}}_{\rm{2}}}^ \oplus {\rm{(iv)O}}_{\rm{2}}^ \ominus }\\
{{\rm{(v)NO}}{\mkern 1mu} {\mkern 1mu} {\rm{(vi)CN}}}
\end{array}\]

1 6

2 5

3 4

4 3

CHXI04:CHEMICAL BONDING AND MOLECULAR STRUCTURE

313755 Which of the following statement is not correct from the view point molecular orbital theory?

1 \(\mathrm{Be}_{2}\) is not a stable molecule

2 \(\mathrm{He}_{2}\) is not stable but \(\mathrm{He}_{2}^{+}\)is expected to exist

3 Bond strength of \(\mathrm{N}_{2}\) is maximum amongst the homonuclear diatomic molecules belonging to the second period

4 The order of energies of molecular orbitals in \(\mathrm{N}_{2}\) molecule is

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