Gem dihalide on hydrolysis gives:

The organic chloro compound,which shows complete stereochemical inversion during an $S_{N}2$ reaction,is

In which of the following is the carbon-halogen bond strongest?

$(R)-2-$octyl tosylate is solvolyzed in water under ideal $S_{N}1$ conditions. The product$(s)$ will be

Determine the number of chiral products (including stereoisomers) formed upon $E_2$ elimination of the given substrate with $alc. KOH$.

An organic compound $A$ $(C_4H_9Cl)$ on reaction with $Na$ in diethyl ether gives a hydrocarbon,which on monochlorination gives only one chloro derivative. $A$ is: