The incorrect method for the synthesis of alkenes is:

The incorrect method for the synthesis of alkenes is:
  1. treatment of alkynes with $\mathrm{Na}$ in liquid $\mathrm{NH}_3$
  2. heating alkyl halides with alcoholic $\mathrm{KOH}$
  3. treating alkyl halides in aqueous $\mathrm{KOH}$ solution
  4. treating vicinal dihalides with $\mathrm{Zn}$ metal

Solution

Alkyl halide in aqueous $\mathrm{KOH}$ results in formation of alcohol. $\mathrm{R}-\mathrm{X}+\mathrm{KOH}(\mathrm{aq}) \longrightarrow \mathrm{R}-\mathrm{OH}$

Asked in: NEET 2022 (Phase 2)

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