Olympiad/HOTS corner

An organic compound 'A' on treatment with acidified potassium dichromate solution gives 'B' with molecular mass $60 \mathrm{g}/\mathrm{mol}$. 'A' on heating with conc.${\mathrm{H}}_2{\mathrm{SO}}_4$ at $443\hspace{0.17em}\mathrm{K}$ produces a gas that decolourises bromine water. The compound 'A' is 

Ethanol is made unfit for drinking by adding 

Dilute solution of alkaline potassium permanganate is known as

What is the IUPAC name of the following compound?

The allotrope of carbon in amorphous form among the following is 

The IUPAC name of $\mathrm{PhCH}=\mathrm{CHCOOH}$ is 

Read the statements about carbon and choose the correct option.

A. It has a small atomic size.

B. Its melting and boiling points are low as compared to other member of the group.

C. It shows an electropositive character.

D. It shows a maximum tendency of catenation.

The highest significant isomers among the following compounds are

A. Methane   B. Propane    C. Butane    D. Hexane