Download App

11.3 Unsaturated Hydrocarbons — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10Chemistry11.3 Unsaturated Hydrocarbons3 Marks
Question
What are addition reactions? Why ethene undergo addition reactions? Give
two examples.
✓

Answer

Addition Reaction : The reactions in which molecules of the attacking reagent add across the double or triple bond of an unsaturated compound to yield saturated compound.
Ethene is a reactive compound due to presence of double bond. hence undergo addition reactions.
Two examples:
(i) Addition of hydrozen :
$
CH _2= CH _2+ H _2 \xrightarrow[300^{\circ} C ]{\stackrel{\text { ni }}{\longrightarrow}} Ch _3- CH _3
$
(ii) Addition of halogens:
$
Ch _2= CH _2+ Br \longrightarrow CH _2 Br - Ch _2 Br
$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "[3 Mark Question Answer]" from 11.3 Unsaturated Hydrocarbons→11.3 Unsaturated Hydrocarbons — all question types→Chemistry STD 10 question papers→ICSE Board STD 10 question papers→ICSE Board question paper generator→

Similar questions

Which concentrated acid oxidizes sulphur directly to sulphuric acid ? Write the equation for the same. What is the name of the process by which sulphuric acid is manufactured ? Name the catalyst used in the process.
→
How is sulphuric acid prepared industrially by contact process? Support your answer by writing fully balanced chemical equations.
→
Write the structural formulae and IUPAC name of the second and third
homologues.
→
Potassium nitrate on strong heating decomposes as under :
$2KNO_3\rightarrow 2KNO_2 + O_2$
Calculate : Weight of oxygen formed when $5.05g$ of potassium nitrate decomposes completely.
$(K = 39, 0 = 16, N = 14)$
→
Give reason for the following:
In the laboratory preparation of nitric acid, the mixture of concentrated sulphuric acid and sodium nitatre should not be heated very strongly, above 200°C
→
How does tooth enamel get damaged? What should be done to prevent it?
→
Separate the following compounds into three categories - ionic, polar and covalent compounds; $N_2, NH_4Cl, NH_3, NO, NH_4NO_3, NCl_3.$
→
On analysis, a substance was found to contain
$C =54.54 \%, H =9.09 \%, O =36.36 \%$
The vapour density of the substance is 44 , calculate;
(a) its empirical formula, and
(b) its molecular formula
→
What is the Vital force theory? Why was it discarded?
→
Industrially, ammonia is obtained by direct combination of nitrogen and hydrogen.
(i) Write balanced equation for the direct combination of nitrogen and hydrogen.
(ii) Which of the metals - iron, platinum, copper - catalyse this direct combination?
(iii) Is the formation of ammonia promoted by high pressure or low pressure?
→