Give chemical test to distinguish between following pair of compounds.
` C_2 H_5 Cl and C_2 H_5 Br `

Explanation

Add a small quantity of aqueous KOH to each compound, acidify with dilute nitric acid and add silver nitrate solution. `C_2 H_5 Cl` gives a white precipitates soluble in `NH_4 OH`.
` C_2H_5 Cl + KOH (aq) to C_2 H_5 OH +KCl`
`KCl +AgNO_3 to underset("Whiteppt.")(AgCl) +KNO_3`
`C_2 H_5 Br ` gives a pale yellow precipitates partially soluble in `NH_4 OH`
`C_2 H_5 Br +KOH (aq) to C_2 H_5 OH + KBr `
`KBr +Ag NO_3 to Ag Br + KNO_3`