The highest boiling point is expected for

Which of the following is true for the given reaction $R-H + X_2 \xrightarrow{hv} R-X + H-X$?

$A$ fuel contains $25 \%$ $n-$heptane and $75 \%$ iso-octane. Its octane number is

When a mixture of methane and oxygen is passed over heated molybdenum oxide, the product obtained is ........ .

Which of the following has the highest octane number?

$(i)$ Give the reaction for the bromination of ethane.
$(ii)$ Is this reaction suitable for obtaining pure bromoethane? Why?
$(iii)$ Give the name of the reaction mechanism and the names of the stages occurring in the reaction.
$(iv)$ Give the reaction for the first stage.
$(v)$ Which type of bond cleavage occurs in the first stage?