The correct increasing order of reactivity for the following molecules towards electrophilic aromatic substitution is
I < IV < II < III
I < IV < II < IV
I < III < II < IV
I < III < IV < II
B.
I < IV < II < IV
The correct increasing order of reactivity is I < IV < II < III. This is because greater is the electron density on aromatic ring, greater is the reactivity towards electrophilic aromatic substitution.
The corrcet decreasing order of pKb is
I > II > III > IV
III > IV > II > I
II > III > IV > I
IV > II > I > III
The correct decreasing order of pKa is
II > IV > I > III
IV > II > III > I
III > II > IV > I
IV > I > II > III
Assertion: Dehydration of alcohols always takes place in basic medium.
Reason : OH- is a better leaving group.
If both assertion and reason are true and reason is the correct explanation of assertion
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Assertion : Toluene in presence of UV rays forms benzaldehyde.
Reason : Dichlorotoluene is formed as an intermediate.
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Assertion : -pleated sheet structure of protein shows maximum extension.
Reason : Intermolecular hydrogen bonding is present in them.
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Assertion : Fructose is a reducing sugar.
Reason : It has a ketonic group.
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Assertion : p-Nitrophenol gives more electrophilic substituted compound than m-methoxyphenol.
Reason : Methoxy group shows only negative I-effect.
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If both assertion and reason are false.