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Resonance Effect

Select the co...

Question

Select the correct statement about this compound.

All three C - N bond length are same.

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C_{1} - N

and

C_{3} - N

bonds length are same but shorter than

C_{5} - N

bonds length.

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C_{1} - N

and

C_{5} - N

bonds length are same but longer than

C_{3} - N

bond length.

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C_{1} - N

and

C_{3} - N

bonds length are different but both are longer than

C_{5} - N

bond length.

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Solution

The correct option is C $C_{1} - N$ and $C_{5} - N$ bonds length are same but longer than $C_{3} - N$ bond length.
In the given compound, due to larger size of bromine atom it create a steric crowding for ortho position $N O_{2}$ groups. Due to this steric hindrance the ortho positioned $N O_{2}$ will get out of benzene plane. Since it is no longer in the plane it wont participitate in resonance of the molecule. But para positioned $N O_{2}$ does not fell any steric effect from Br so it will involve in resonance of the molecule. Therefore $C - N$ in para position acquire double bond character, hence the bond length is shorter than the $C - N$ bond length in ortho position

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Similar questions

Q. Select the incorrect statement(s) about

N_{2} F_{4}

and

N_{2} H_{4}

.
(i) In

N_{2} F_{4}

, d-orbitals are contracted by electronegative fluorine atoms, but d-orbital contraction is not possible by H-atoms in

N_{2} H_{4}

.
(ii) The

N - N

bond energy in

N_{2} F_{4}

is more than

N - N

bond energy in

N_{2} H_{4}

.
(iii) The

N - N

bond length in

N_{2} F_{4}

is more than that in

N_{2} H_{4}

.
(iv) The

N - N

bond length in

N_{2} F_{4}

is less than that in

N_{2} H_{4}

.
Choose the correct code.

Q. The correct order regarding bond length:
(i)

N_{2} H_{2} < N_{2} H_{4}

(N - N Bond length)
(ii)

N O > N O^{+}

(N - O Bond length)
(iii)

C_{2} H_{4} > K [P t C I_{3} (C_{2} H_{4})]

(C - C Bond length)
(iv)

P O F_{3} > P O C I_{3}

(P - O Bond length)

Q. Assertion :Bond order for

N_{2}^{+}

and

N_{2}^{-}

are same but

N_{2}^{+}

is more stable than

N_{2}^{-}

. Reason: Anitbonding electrons are more in

N_{2}^{-}

Q. Which of the following statement is correct in the context of the

N_{2} O

molecule?

Q. In phosgene,

C - O

bond length is longer than expected but

C - C l

bond length is shorter than expected. This is due to ____.

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Resonance Effect

Standard XII Chemistry

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