Which of the following will be the correct product of reaction?

 

Which reagent is best to perform the following transformation?

Which of the following compounds was starting material for the oxidation shown below?

A triene treated with ozone followed by $\mathrm{CH}3-\mathrm{S}-\mathrm{CH}3$ to give following three products. What is the structure of triene?

Arrange the following compounds in decreasing order of rate of electrophilic addition reaction.

Select the best starting material for the following reaction: 

Consider the following rearrangement reaction. 

Which of the following reaction co-ordinates peaks represents overall reaction?