Organic Chemistry Multiple Choice Questions and Answers – Resonance and Aromaticity

Questions
1 Resonance forms are in equilibrium with each other.
A True
B False

Answer: False
2 Identify the false statement regarding resonance.
A As the number of charges increases, the resonance forms gets more significant
B Zero charge of resonance is the most significant one
C Atoms with full octet resonance form are more stable when compared with the one with unfilled octet
D Resonance is unstable in case of unfilled octet of nitrogen atom

Answer: As the number of charges increases, the resonance forms gets more significant
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3 Identify the correct sequence according to electronegativity.
A F > NH2 > CH3 >OH`
B NH2 `> F` >CH3` > OH`
C NH2 `> OH` > CH3` > F`
D F` > OH` > NH2` > CH3`

Answer: F` > OH` > NH2` > CH3`
4 Identify the correct sequence with respect to Inductive effects.
A CF3`> CH2F`> CHF2`> CF3`
B CF3`> CHF2`> CH2F`> CH3`
C CH3`> CH2F`> CHF2`> CF3`
D CH3`> CHF2`> CH2F`v CF3`

Answer: CF3`> CHF2`> CH2F`> CH3`
5 Stability sequence: primary carbocation > secondary carbocation > tertiary carbocation. Is this sequence correct?
A Yes
B No

Answer: No
6 Identify the incorrect statement regarding aromaticity.
A It is the extra stability possessed by a molecule
B p-orbitals must be planar and overlap
C Cyclic delocalization takes place
D It does not follow Huckel’s rule

Answer: It does not follow Huckel’s rule
7 Aromatic rings do not have resonance structures.
A False
B True

Answer: False
8 Select the correct statement regarding the aromatic nitrogen molecule.
A It is not hybridized
B It is sp hybridized
C It is sp2 hybridized
D It is sp3 hybridized

Answer: It is sp2 hybridized
9 Can a linear molecule have aromaticity.
A Yes
B No

Answer: No
10 Select the incorrect statement.
A A resonance may sometimes cause sp3 atoms to become sp2 hybridized
B Delocalizing one lone pair causes aromaticity
C One lone pair will be counted as two pi electrons according to Huckel’s equation
D Two sigma bonds make up a double bond

Answer: Two sigma bonds make up a double bond

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