Test Index

CBSE Class 10 Science 2023 Delhi Set 3

© examsnet.com
Question : 10 of 10
Marks: +1, -0
(A) Write the chemical equation for the following:
(i) Combustion of methane
(ii) Oxidation of ethanol
(iii) Hydrogenation of ethene
(iv) Esterification Reaction
(v) Saponification Reaction
OR
(B) (i) Draw two structural isomers of butane.
(ii) Draw the structures of propanol and propanone.
(iii) Name the third homologue of:(a) alcohols(b) aldehydes
(iv) Name the following:
(v) Show the covalent bond formation in nitrogen molecule.
Solution:  
(A) (i) Combustion of methane:
CH4+2O2→CO2+2H2O\mathrm{CH}_4+2\mathrm{O}_2\rightarrow\mathrm{CO}_2+2\mathrm{H}_2\mathrm{O}
(ii) Oxidation of ethanol:
C2H5OH+3O2→2CO2+3H2O\mathrm{C}_2\mathrm{H}_5\mathrm{OH}+3\mathrm{O}_2\rightarrow2\mathrm{CO}_2+3\mathrm{H}_2\mathrm{O}
(iii) Hydrogenation of ethene:
C2H4+H2→C2H6\mathrm{C}_2\mathrm{H}_4+\mathrm{H}_2\rightarrow\mathrm{C}_2\mathrm{H}_6
(iv) Esterification reaction: Carboxylic acid + Alcohol →\rightarrow Ester + Water
For example:
CH3COOH+C2H5OH→CH3COOC2H5+H2O\mathrm{CH}_3\mathrm{COOH}+\mathrm{C}_2\mathrm{H}_5\mathrm{OH}\rightarrow\mathrm{CH}_3\mathrm{COOC}_2\mathrm{H}_5+\mathrm{H}_2\mathrm{O}
(v) Saponification reaction:
Ester +NaOH→+\mathrm{NaOH}\rightarrow Salt of carboxylic acid + Alcohol
For example:
C2H5COOCH3+NaOH→C2H5COONa+CH3OH\mathrm{C}_2\mathrm{H}_5\mathrm{COOCH}_3+\mathrm{NaOH}\rightarrow\mathrm{C}_2\mathrm{H}_5\mathrm{COONa}+\mathrm{CH}_3\mathrm{OH}
(B) (i) The two isomers of butane, C4H10\mathrm{C}_4\mathrm{H}_{10} are:
(iii) (a) The third homologue of alcohols is propanol, with the chemical formula C3H7OH\mathrm{C}_3\mathrm{H}_7\mathrm{OH}. It has a straight chain of three carbon atoms and a hydroxyl (−OH)(-\mathrm{OH}) group attached to the second carbon.
(b) The third homologue of aldehydes is propanal, with the chemical formula C3H6O\mathrm{C}_3\mathrm{H}_6\mathrm{O}. It has a straight chain of three carbon atoms with a carbonyl group (C=O)(\mathrm{C}=\mathrm{O}) attached to the second carbon.
(iv) (a) Benzene
(b) 'But-1-ene'
© examsnet.com
Go to Question:
Prev Question