Which branched chain isomer of the hydrocarbon with molecular mass $72 \ u$ gives only one isomer of mono-substituted alkyl halide?

One mole of an alkane $(x)$ requires $8$ mole oxygen for complete combustion. The sum of the number of carbon and hydrogen atoms in the alkane $(x)$ is . . . . . . .

Which of the following formulas represents a saturated cyclic compound?

$(i)$ 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?

What is the general molecular formula for a cycloalkane?

Isobutyl magnesium bromide with dry ether and absolute alcohol gives