Answer the following.
Give balanced chemical equations for the following reactions: (1) Phenol is treated with ice cold…
Answer
Answer (i)
AIEquations: $\mathrm{C_{6}H_{5}OH} + \mathrm{C_{6}H_{5}N_{2}Cl} + \mathrm{NaOH} \xrightarrow{\text{ice}\text{ }\text{cold}\text{,}\text{ }\text{alkaline}} \mathrm{C_{6}H_{5}N=NC_{6}H_{4}OH} + \mathrm{NaCl} + \mathrm{H_{2}O}$ $\mathrm{C_{2}H_{5}OC_{2}H_{5}} + \mathrm{PCl_{5}} \longrightarrow 2\mathrm{C_{2}H_{5}Cl} + \mathrm{POCl_{3}}$ $\mathrm{C_{2}H_{5}OH} + \mathrm{SOCl_{2}} \longrightarrow \mathrm{C_{2}H_{5}Cl} + \mathrm{SO_{2}} + \mathrm{HCl}$
Reaction: Coupling reaction
Products: p-hydroxyazobenzene, chloroethane
Answer (ii)
AI| Pair | Test | First compound | Second compound |
|---|---|---|---|
| 1. Ethanol and dimethyl ether | Iodoform test ($\mathrm{I_2}$ / NaOH, warm) | Ethanol gives a yellow precipitate of iodoform | Dimethyl ether gives no change |
| 2. Propan-1-ol and propan-2-ol | Iodoform test ($\mathrm{I_2}$ / NaOH, warm) | Propan-1-ol gives no change | Propan-2-ol gives a yellow precipitate of iodoform |
From ISC 2020 Chemistry Paper 1, question 18(a).
Check your working with the Chemical equation balancer: balance any equation, ionic and redox ones too, with the atom count on each side.
Check your working with the Distinguish two organic compounds: the chemical tests that tell two organic compounds apart, with what each one shows.