The compound with molecular formula $C_{20}H_{42}$ is

Consider the following reaction sequence and identify the major product $P$.
$CH_3CH_2OH$ $\xrightarrow[(ii) KMnO_4]{(i) Jones' Reagent}$ $\xrightarrow[(iii) NaOH, CaO, \Delta]{} P$

Write the chemical reactions for the preparation of ethane from the following compounds:
$(i)$ Bromo-methane
$(ii)$ Propanoic acid

In which of the following reactions is the product a hydrocarbon?

The relative reactivities for the replacement of $-H$ are $3^o : 2^o : 1^o = 6 : 4 : 1$. For the reaction shown in the image,determine the relative amount of the given product.

Give the general formula of an alkyl group.