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Question

Select the correct statement(s).


A
Pyridine is more basic than pyrrole
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B
CH3,:CCl2,I all three species are electrophiles 
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C
1,3-butadiene has a higher heat of hydrogenation than 2-butene
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D
Order of acidic strength: o-nitrophenol>p-nitrophenol>m-nitrophenol
 
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Solution

The correct options are
A Pyridine is more basic than pyrrole
C 1,3-butadiene has a higher heat of hydrogenation than 2-butene
(a) The lone pair on N of pyrrole is involved in conjugation with double bonds of cyclic ring which is responsible for aromaticity, whereas the lone pair on N of pyridine is available to donate. Hence pyridine is more basic than pyrrole. 

(b) I is electron rich and therefore is a nucleophile. 

(c) More the number of pi bonds, more positive would be the heat of hydrogenation. Hence 1,3-butadiene has higher heat of hydrogenation than 2-butene.

(d) Due to intramolecular H-bonding in o-nitrophetnol, the H atom of -OH group is tightly attached and is difficult to remove. m-nitrophenol is the least acidic as M effect of NO2 is not there at the meta position.
Thus, acidic strength order is: p-nitrophenol>o-nitrophenol>m-nitrophenol

 

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