2-Position of pyrrole is more reactive towards electrophilic substitution than
3-position. Explain giving all possible resonance structures of carbocations formed. Explain.
Pyrroles generally react with electrophiles at the α position (C2 or C5), due to the highest degree of stability of the protonated intermediate.
Resonance puts partial
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Arrange the following in the decreasing order of their basic strength:
alkanide anion; alkenide anion; alkynide anion
Justify your answer.
2-Position of pyrrole is more reactive towards electrophilic substitution than
3-position. Explain giving all possible resonance structures of carbocations formed. Explain.
Draw cis and trans- isomers of 1,3-cyclobutanedicarboxylic acid. Comment on the dipole moment of these isomers.
Give the IUPAC names of the following compounds:
(i) 
(ii) 
(iii) BCH 2CH2CH2OH
Fill in the following blanks:
(i) In the UV spectrum, the ethylenic chromophore shows an absorption band below -------------- nm.
(ii) In the IR spectrum, the cis isomer of internal alkenes gives band at --------- cm-1.
Suggest the reaction that can best be used to prepare following ethers by Williamson ether synthesis
(a) CH3CH 2— O— CH= CH2
(b) 
Explain the following in one to two lines.
(i) Alkenes are more soluble in water than corresponding alkanes.
(ii) Addition reactions of alkenes are exothermic processes.
(iii) Hydroboration appear as anti-Markownikoff’s addition.