What product is obtained when ethyl hydrogen sulphate is heated with an excess of alcohol at $410 \, K$?

Explain competition in detail.

The compound formed on heating chlorobenzene with chloral in the presence of concentrated sulphuric acid is:

$A$ glucose molecule reacts with $X$ number of molecules of phenylhydrazine to yield osazone. The value of $X$ is

$A$ horizontal force of $10\,N$ is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is $0.2$. The weight of the block is ........ $N$.

$A$ disc of radius $R$ is made to oscillate about a horizontal axis passing through its periphery. Its time period would be