Discuss Bischer synthesis of indole. How can you obtain a single product in this reaction?  

 Illustrate giving two [3+2] cycloaddition reactions how can 1,3-dipolar compounds react with alkenes and alkynes to give pyrazoles.

Give the products of the reaction of azetedine with the following reagents:

(i) RCOCI

(ii) CS2

(iii) HNO2

(iv) HCHO

(v)HCI/A

 Discuss how can tetraalkylaziridines be synthesised.

 Explain the chemical shift values exhibited in the 'H-NMR spectrum of pyridine.

Pyrazine

 Pyridazine

 2,5-Diazaanthracene

 2-Methylazacyclohexane

Pyrazino [2, 3,-c] pyridazine

Write the names of the following compounds according to Hantzsch-Widman system of nomenclature.

 Explain the natural drivers of climate change.

 Explain the sources of palaeoclimatic data.

General Circulation Models

Representative Concentration Pathway

 Explain the National Action Plan on Climate change.

Explain the features of the Paris Agreement on Climate Change

 "Cloud feedback" and "Lapse-rate feedback"

. Radiative Forcing

 Preventive actions that could have avoided the accident