Chloroform can be obtained from

Alcohols combine with acetylene in the presence of mercury compounds as catalyst to form

What will be $A$,$B$,$C$,and $D$ in the following reaction sequence?
Cyclohexanol $\xrightarrow[H_2SO_4]{CrO_3} A$ $\xrightarrow[(ii) H_3O^+]{(i) CH_3MgI} B$ $\xrightarrow{\Delta, H_2SO_4} C$ $\xrightarrow[(ii) H_2O_2, NaOH]{(i) (BH_3)_2} D$

Amongst the following compounds,identify which are insoluble,partially soluble,and highly soluble in water:
$(i)$ phenol,$(ii)$ toluene,$(iii)$ formic acid,$(iv)$ ethylene glycol,$(v)$ chloroform,$(vi)$ pentanol.

Ethylene may be obtained by dehydration of which of the following with concentrated $H_2SO_4$ at $160-170 \ ^oC$?

What is obtained by the reaction of primary and secondary alcohols with red-hot copper at $573 \ K$?