A) \[HI/200{{\,}^{o}}C\]
B) Conc. \[{{H}_{2}}S{{O}_{4}}/140{{\,}^{o}}C\]
C) \[NaOH/70{{\,}^{o}}C\]
D) \[NaO{{C}_{2}}{{H}_{5}}/27{{\,}^{o}}C\]
Correct Answer: B
Solution :
Preparation of diethyl ether from ethyl alcohol: When ethyl alcohol is heated with cone. \[{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\]at \[\text{140}{{\,}^{\text{o}}}\text{C}\]diethyl ether is obtained and when ethyl alcohol is heated with conc. \[{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\]at \[\text{170}{{\,}^{\text{o}}}\text{C}\,\,\,{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{4}}}\]is obtained as \[{{C}_{2}}{{H}_{5}}\,O{{C}_{2}}{{H}_{5}}\xrightarrow[140{{\,}^{o}}C]{Conc.{{H}_{2}}S{{O}_{4}}}\] \[\underset{\text{Diethyl}\,\text{ehter}}{\mathop{{{C}_{2}}{{H}_{5}}-O-{{C}_{2}}}}\,{{H}_{5}}+{{H}_{2}}O\] \[{{C}_{2}}{{H}_{5}}OH\xrightarrow[170\,{{\,}^{o}}C]{Conc.{{H}_{2}}S{{O}_{4}}}\underset{\text{Ethene}}{\mathop{{{C}_{2}}{{H}_{4}}}}\,+{{H}_{2}}O\]
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