Organic Chemistry Answers

a) Explain isocyanide reaction and its importance.
b) Give examples of the following reactions:
i) Gattermann reaction
ii) Gomberg – Bachmann reaction
iii) Schiemann reaction

a) Explain Henry reaction using aliphatic and aromatic aldehydes.
b) How will you prepare 1,4-dinitrobenzene by starting with benzenamine?

Explain the following:
i) Lactones
ii) Zwitter ion
iii) Lactam

What is Fischer esterfication? Explain its mechanism.

a) By taking a suitable example, give one laboratory test which is commonly used for the detection of aldehydes and ketones. Write the names of two reagents used for distinguishing between aldehydes and ketones.
b) Write chemical reactions for following name reaction:
i) Benzoin condensation
ii) Gattermann synthesis

Define grerade and increase orbits. Classify the following orbitals as gerade or ungerade.
I- 1s ii- 2px iii- 3dxy

3-Bromocyclohex-1-ene or 2-Bromocyclohex-1-ene, which would undergo a faster SN1 reaction?

Reaction of indole with HCN and HCl will yield??

Explain mechanistically-
1. Acetone phenylhydrazone is heated with sulphuric acid in ethanol.
2. N-(2-phenylethyl)acetamide with phosphorus oxychloride and product is heated with selenium.

By taking a suitable example, write the mechanism of the reaction of a thiol with an alkyl halide. Explain why thiols react more rapidly than open chain ethers.