Write chemical reactions for the following:

(i) Kolbe Schmidt reaction

(ii) Strecker synthesis

(iii) Dzeckmann cobndensation

(iv) Knoevenagel reaction

(v) Perkin condensation 

Explain Hell-Vollhard-Zelinski reaction. Also illustrate its synthetic importance.

Derive the symbol for the ground state of hydrogen atom.

What is Rydberg constant? Calculate its value. Why is its experimental value different from the calculated value? 

Write the mechanism for the haloform reaction.

Suggest the reaction that can best be used to prepare following ethers by Williamson ether synthesis

(a) CH₃CH_2^- O^- CH= CH₂

_(b) 

Retrosynthesis

Write the chemical equation for following named reactions:

a) Reimer-Tiemann reaction

b) Kolbe reaction

c) Claisen reaction

d) Knoevenagel reaction

e) Willgerodt reaction

Condensation polymers

Antibiotics

Auxochromes

Cleaning action of soaps

Describe reaction types used to construct a carbon skeleton with suitable examples. 

Taking suitable examples, explain the role of sensitisers in photo-reactions.

Explain the mechanism of [4+2] cycloaddition reaction.

Write detail mechanism for the following rearrangements:

i) Wagner-Meerwein rearrangement

ii) Beckmann rearrangement

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. 

Explain, why the reaction of m-bromoanisole with sodamide gives only one product. b) Describe the bromination reactions at allylic and benzylic positions by N-bromosuccinimide.

Write the chemical reaction for the following reactions along with their detail description:

a) Reimer-Tiemann reaction

b) Carbylamine reaction

c) Witting reaction

d) Wolff rearrangement

e) Hofmann rearrangement

Pyrrole is more basic than pyridine.