The correct order of melting and boiling points of the primary $(1^o)$,secondary $(2^o)$ and tertiary $(3^o)$ alkyl halides is:

Pure $CHCl_3$ and pure $CHI_3$ can be distinguished by which of the following?

Given below are two statements $:$
Statement $(I) :$ $cis-1,2-dichloroethene$ is more polar than $cis-1,2-dibromoethene$.
Statement $(II) :$ Boiling point of $trans-1,2-dibromoethene$ is lower than $cis-1,2-dibromoethene$ but it is more polar than $cis-1,2-dibromoethene$.
In the light of the above statements,choose the most appropriate answer from the options given below $:$

Which of the following products is not formed in the following reaction?
$Vinylcyclopentane + HBr \rightarrow ?$

What is the bond length between carbon and bromine in $CH_3Br$ molecule (in $pm$)?

Identify the reaction mechanisms for steps $I$ and $II$ in the given transformation:
$CH(Me)(Et)Cl + OH^- \rightarrow CH(Me)(Et)OH$
(Refer to the provided image for stereochemical outcomes $A$ and $B$)