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ICSE Class 10 Chemistry Question 36 of 93

Organic Chemistry — Question 22

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Question 3(2010)

Compound 'X' is bubbled through bromine dissolved in CCl4 and the product formed is CH2Br – CH2Br.

i) Draw the structural formula of 'X' and state what type of reaction 'X' has undergone.

(ii) State your observation for the above reaction.

(iii) Name the compound formed when steam reacts with 'X' in the presence of an acid, eg. phosphoric acid.

(iv) What is the procedure for converting the product formed in (iii) above, back to 'X' ?

Answer

(i) Compound 'X' is Ethene (H2C=CH2). Its structural formula is shown below:

Compound X is bubbled through bromine dissolved in CCl4 and the product formed is CH2Br – CH2Br. Draw the structural formula of X and state what type of reaction X has undergone. Organic Chemistry, Simplified Chemistry Dalal Solutions ICSE Class 10

Ethene [CH2=CH2] has undergone addition reaction.

(ii) Brown colour of bromine is discharged.

(iii) Ethanol

C2H4Ethene+H2O water→H+acidC2H5OH ethanol\underset{\text{Ethene}}{\text{C}_2\text{H}_4} + \underset{\text{ water} }{\text{H}_2\text{O}} \underset{\text{acid}}{\xrightarrow{\text{H}}^+} \underset{\text{ ethanol} }{\text{C}_2\text{H}_5\text{OH}}

(iv) Ethanol can be converted into ethene, by dehydrating it with concentrated H2SO4 at 170°C.

C2H5OH ethyl alcohol→170°CConc. H2SO4[excess]C2H4ethene+H2O \underset{\text{ ethyl alcohol}}{\text{C}_2\text{H}_5\text{OH}} \xrightarrow[170\degree\text{C}]{\text{Conc. H}_2\text{SO}_4\text{[excess]}} \underset{ \text{ethene}}{\text{C}_2\text{H}_4} + \text{H}_2\text{O}\