Question
The best method to prepare cyclohexene from cyclohexanol is by using
A.
$$Conc.\,HCl + ZnC{l_2}$$
B.
$$Conc.\,{H_3}P{O_4}$$
C.
$$HBr$$
D.
$$Conc.\,HCl$$
Answer :
$$Conc.\,{H_3}P{O_4}$$
Solution :
TIPS/Formulae :
Conc. $$HCl,\,HBr$$ and conc. $$HCl + ZnC{l_2}$$ all are nucleophiles, thus convert alcohols to alkyl halides.
However, conc. $${H_3}P{O_4}$$ is a good dehydrating agent which converts an alcohol to an alkene.