Identify compounds x and y, respectively in the given reaction:

1.
2.
3.
4.

Which one of the following pairs will be produced when Mg₂C₃ and CaC₂ react with H₂O respectively? 

Which of the following alkanes cannot be made in good yield by Wurtz reaction :

The increasing order of reduction of alkyl halides with zinc and dilute HCl is:

1. $\mathrm{R}-\mathrm{Cl}<\mathrm{R}-\mathrm{I}<\mathrm{R}-\mathrm{Br}$

2. $\mathrm{R}-\mathrm{Cl}<\mathrm{R}-\mathrm{Br}<\mathrm{R}-\mathrm{I}$

3. $\mathrm{R}-\mathrm{I}<\mathrm{R}-\mathrm{Br}<\mathrm{R}-\mathrm{Cl}$

4. $\mathrm{R}-\mathrm{Br}<\mathrm{R}-\mathrm{I}<\mathrm{R}-\mathrm{Cl}$