Prashnikaप्रश्निका
‹ Back to the paper

Answer the following.

An aliphatic compound [A] with the molecular formula is reduced to compound [B]. Compound [B]…

Chemistry20262.5 marksIdentify
An aliphatic compound [A] with the molecular formula $\text{C}_2\text{H}_4\text{O}$ is reduced to compound [B]. Compound [B] reacts with $\text{PCl}_5$ and forms compound [C]. Compound [C] on treatment with alcoholic $\text{KOH}$ forms compound [D] which is used to make a daily use plastic. Identify the compounds [A], [B], [C] and [D].

Answer

Answer

AI

Equations: $\mathrm{CH_{3}CHO} + \mathrm{H_{2}} \xrightarrow{\text{Ni}\text{,}\text{ }\text{reduction}} \mathrm{C_{2}H_{5}OH}$ $\mathrm{C_{2}H_{5}OH} + \mathrm{PCl_{5}} \longrightarrow \mathrm{C_{2}H_{5}Cl} + \mathrm{POCl_{3}} + \mathrm{HCl}$ $\mathrm{C_{2}H_{5}Cl} + \mathrm{KOH} \xrightarrow{\text{alc.}\text{ }\text{KOH}\text{,}\text{ }\text{heat}} \mathrm{CH_{2}=CH_{2}} + \mathrm{KCl} + \mathrm{H_{2}O}$

A - ethanal: CH3CHO

B - ethanol: C2H5OH

C - chloroethane: C2H5Cl

D - ethene: CH2=CH2

A = ethanal ($\mathrm{CH_3CHO}$) B = ethanol ($\mathrm{C_2H_5OH}$) C = chloroethane ($\mathrm{C_2H_5Cl}$) D = ethene ($\mathrm{CH_2=CH_2}$), which polymerises to polythene.
Aldehydes and Ketones

From ISC 2026 Improvement Chemistry Paper 1, question 19(ii).

More from this chapter