What is aci form of nitroethane? Discuss.
Introduction of a nitro group into a hydrocarbon considerably enhances the thermodynamic acidity of the C—H bond. For example, nitroethane has PK 8.60 1991. The effect of the nitro goup is comparable to the effect of the two keto groups in acetylacetone (PK 8.9) L 171 . The nitrocarbanion (or nitronate ion) is strongly
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Explain Hell-Vollhard-Zelinski reaction. Also illustrate its synthetic importance.
Write chemical reactions for the following:
(i) Kolbe Schmidt reaction
(ii) Strecker synthesis
(iii) Dieckmann cobndensation
(iv) Knoevenagel reaction
(v) Perkin condensation
Give the IUPAC names of the following compounds:
(i) 
(ii) 
(iii) BCH 2CH2CH2OH
Arrange the following in the decreasing order of their basic strength:
alkanide anion; alkenide anion; alkynide anion
Justify your answer.
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.
What are nucleotides? Draw the structures of nucleotides present in DNA and give their names.
Match the following ions with their correct pKa values and give reasons for your answer:
Column I, Ion Column II, pKa
