Question

C2Н2→С2Н4→С2Н5ОН→С2Н5Сl→С2Н5ОН→С4Н10О 

Answer 1

C2Н2 + H2→С2Н4

C2H4 + H2O→С2Н5ОН

C2H5OH + HCl→С2Н5Сl

C2H5Cl + KOH ---водная среда→С2Н5ОН

С2H5OH (в присутствии серной кислоты при температуре до 140)→С2Н5ОС2Н5 (диэтиловый эфир)  

Answer 2

The series of reactions you provided can be summarized as follows:

1. C2H2 (acetylene) reacts to form C2H4 (ethylene). This reaction involves the addition of hydrogen (H2) to acetylene, typically under high pressure and in the presence of a catalyst. The reaction can be represented as:

   C2H2 + H2 -> C2H4

2. C2H4 (ethylene) reacts with OH- (hydroxide ion) to form C2H5OH (ethanol). This reaction is an example of an acid-base reaction where ethylene acts as an acid and hydroxide ion acts as a base. The reaction can be represented as:

   C2H4 + OH- -> C2H5OH

3. C2H5OH (ethanol) reacts with HCl (hydrochloric acid) to form C2H5Cl (ethyl chloride). This reaction is an example of a nucleophilic substitution reaction. The hydroxide group (-OH) in ethanol is replaced by a chlorine atom from hydrochloric acid. The reaction can be represented as:

   C2H5OH + HCl -> C2H5Cl + H2O

4. C2H5Cl (ethyl chloride) reacts with NaOH (sodium hydroxide) to form C2H5OH (ethanol) again. This reaction is an example of an elimination reaction. The chlorine atom in ethyl chloride is replaced by a hydroxide group from sodium hydroxide. The reaction can be represented as:

   C2H5Cl + NaOH -> C2H5OH + NaCl

5. C2H5OH (ethanol) can react further to form C4H10O (butanol), although the specific reaction pathway is not provided in your sequence. Butanol is a four-carbon alcohol and can be formed by various methods, such as the hydration of butene or the reduction of butanal.

   C2H5OH -> C4H10O (specific reaction pathway not provided)

It's important to note that each step in this reaction sequence may require specific reaction conditions, such as temperature, pressure, catalysts, and solvent. Additionally, the sequence you provided does not specify the exact reaction conditions or the yields of each step, so the overall efficiency and success of the reactions cannot be determined.