What is resonance energy? Explain taking the example of benzene.
The resonance energy of a compound is a measure of the extra stability of the conjugated system compared to the corresponding number of isolated double bonds. This can be calculated from experimental measurements.
Every structure is associated with a certain quantity of energy, which determines the stability of the molecule or ion (the lower energy, the greater stability). A resonance hybrid has a structure that is intermediate between the contributing structures; the total quantity of potential energy, however, is lower than the intermediate and the molecule is said
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Write the mechanism for the Haloform reaction.
Among alkyl halides, order of reactivity of SN2 reaction is
CH3X> p-RX >Sec-RX > tert-RX
Discuss the factors which are mainly responsible for this order.
Arrange the following in the decreasing order of their basic strength:
alkanide anion; alkenide anion; alkynide anion
Justify your answer.
Match the following ions with their correct pKa values and give reasons for your answer:
Column I, Ion Column II, pKa
write the chemical equation for following named reactions:
(a) Reimer-Tiemann reaction
(b) Kolbe reaction
(c) Claisen reaction
(d) Knoevenagel reaction
(e) Willgerodt reaction
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2-Position of pyrrole is more reactive towards electrophilic substitution than
3-position. Explain giving all possible resonance structures of carbocations formed. Explain.