VIT - VITEEE 2025
National level exam conducted by VIT University, Vellore | Ranked #11 by NIRF for Engg. | NAAC A++ Accredited | Last Date to Apply: 31st March | NO Further Extensions!
Mesomeric or Resonance Effect is considered one the most difficult concept.
32 Questions around this concept.
The order of stability of the following carbocations:
is :
Which one of the following has highest C-N bond length
Which of the following compounds does not exhibit resonance?
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Which of the following group shows +R or +M effect
Which of the following is ortho-para directing group
Which one of the following substituents at para-position is most effective in stabilizing the phenoxide ion ?
In electrophilic aromatic substitution reactions of chlorobenzene, the ortho/para-directing
ability of chlorine is due to its
National level exam conducted by VIT University, Vellore | Ranked #11 by NIRF for Engg. | NAAC A++ Accredited | Last Date to Apply: 31st March | NO Further Extensions!
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The interaction between $\pi$ bond and lone pair of electrons present on an adjacent atom is responsible for :
The resonance effect is defined as ‘the polarity produced in the molecule by the interaction of two π-bonds or between a π-bond and lone pair of electrons present on an adjacent atom’. The effect is transmitted through the chain. There are two types of resonance or mesomeric effects designated as R or M effects.
The atoms or substituent groups, which represent +R or –R electron displacement effects are as follows :
The presence of alternate single and double bonds in an open-chain or cyclic system is termed as a conjugated system. These systems often show abnormal behaviour. The examples are 1,3- butadiene, aniline and nitrobenzene etc. In such systems, the π-electrons are delocalised and the system develops polarity.
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