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What is negative mesomeric effect and give the decreasing order of negative mesomeric effect groups?

Important Questions on Organic Chemistry- Some Basic Principles and Techniques

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The correct increasing order of the basic strength for the following compounds is:

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The hyperconjugative stabilities of tert-butyl cation and 2-butene, respectively, due to 
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The N which contribute least to the basicity of the compound is :
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MEDIUM
The correct order for acid strength of compounds CHCH,CH3-CCH and CH2=CH2 is as follows:
HARD
The increasing order of basicity of the following compounds is : 
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In case of substituted aniline the group which decreases the basic strength is
MEDIUM
The increasing order of pKb for the following compounds will be :
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EASY
Consider the following compounds

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Hyperconjugation occurs in:
HARD

What is the order of basicity among the following compounds?

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MEDIUM
Which of the following carbocations is expected to be the most stable?
HARD
The increasing order of the pKb  of the following compund is:
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EASY
Among the following oxoacids, the correct decreasing order of acid strength is :
HARD
An organic compound X showing the following solubility profile is:
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EASY

The correct order of acid strength of the following carboxylic acids is -

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MEDIUM
The increasing order of basicity for the following intermediates is (from weak to strong)
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MEDIUM
In which of the following molecules, all atoms are coplanar?
MEDIUM
The correct statement regarding the basicity of aryl amines is:
EASY

The major substitution product (X) of the following reaction is

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