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Class 10 Chemistry Chapter 21 Organic Chemistry Test 1
Grade 10 Chemistry Chapter 21 Organic Chemistry Test 1
Prepare for the Punjab Board Class 10 Chemistry Examination 2027 with Chapter 21: Organic Chemistry – Class Test No. 1. This full chapter test, including textbook exercises, is designed to help students revise important concepts and practice exam-oriented questions according to the new Chemistry syllabus issued by PECTAA Punjab. As part of the Punjab Board 2027 Model Papers, this test is included in our comprehensive Class 10 Chemistry Chapter-Wise Test Series and Full Unit Model Papers. Practice the Organic Chemistry chapter test to evaluate your understanding, improve your problem-solving skills, and strengthen your preparation for the 2027 annual board examinations.
ChemistryChapter-21 (Objective)Class Test-1
1. Organic compound are primarily composed of element:(Q-1)
(a) carbon(b) oxygen(c) hydrogen(d) sulfur
2. There are of organic compounds.(Q-4)
(a) Hundreds(b) Thousands(c) Millions(d) Billions
3. Formula of benzene is(Q-9)
(a) C3H6(b) C4H8(c) C5H10(d) C6H6
4. Name of compound CH3COOH is:(Q-14)
(a) Butanol(b) Ethanol(c) Ethanoic acid(d) Propanoic acid
5. Compounds having similar molecular formula but different structure formula called :(Q-20)
(a) isotopes(b) Isomer(c) homologous(d) polymers
6. When the carbon atom increases to thirty, the number of isomers is over:(Q-25)
(a) Two billion(b) Three billion(c) Four billion(d) Five billion
7. Simplest alkane is(Q-30)
(a) Methane(b) Ethane(c) Ethene(d) Alkyne
8. Which class contain single covalent bonds?(Q-32)
(a) Alkane(b) Alkene(c) alkyne(d) Benzene
9. Monohydroxy derivative of alkane is called(Q-36)
(a) alkene(b) alkyne(c) carboxylic acid(d) alcohol
10. General formula of carboxylic acid is(Q-38)
(a) RCOOH(b) RCOH(c) RCOR(d) RCOOR
ChemistryChapter-21 (Subjective)Class Test-1
i.What are organic compound?
(Q-1)Compounds that contain carbon (usually bonded with hydrogen, and often oxygen, nitrogen, sulfur or halogens) are called organic compounds, e.g. CH4, C2H5OH.
ii.Define organic chemistry.
(Q-4)The branch of chemistry which deals with the study of carbon compounds (other than carbonates, oxides of carbon, etc.), their structures, properties and reactions is called organic chemistry.
iii.Define and example of heterocyclic compounds.
(Q-7)Cyclic compounds whose ring contains atoms of carbon and at least one other element (N, O or S) are heterocyclic compounds. Example: pyridine C5H5N, furan C4H4O.
iv.What is structure formula?
(Q-11)A formula that shows the arrangement of atoms and bonds in a molecule. Example: ethanol CH3–CH2–OH.
v.What is display formula? Give example
(Q-13)A structural formula in which all atoms and all covalent bonds are shown. Example: methane
vi.Write the displayed and condense formula of propane
(Q-15)Condensed: CH3CH2CH3 (C3H8)
Displayed:
Displayed:
vii.What is meant by family of organic compounds?
(Q-17)A group of organic compounds having the same functional group and similar chemical properties, e.g. alcohols (–OH), carboxylic acids (–COOH).
viii.Write any two characteristics of homologous series.
(Q-20)1) All members have the same functional group and general formula.
2) Adjacent members differ by a CH2 unit (14 amu) and show a gradual change in physical properties.
2) Adjacent members differ by a CH2 unit (14 amu) and show a gradual change in physical properties.
ix.What happens to the number of isomers as a number of carbon atom of increase?
(Q-22)The number of possible isomers increases rapidly (e.g. C4H10 has 2, C5H12 has 3, C30H62 has over four billion).
x.Define. Functional group.
(Q-26)An atom or group of atoms in a molecule that determines its characteristic chemical properties, e.g. –OH, –COOH, >C=O.
xi.What is alkane?
(Q-30)Saturated hydrocarbons having only single covalent bonds (C–C and C–H) with general formula CnH2n+2, e.g. CH4, C2H6.
xii.Write any two rules of giving the name of alcohol
(Q-35)1) Select the longest carbon chain containing the –OH group; drop the last “e” of the alkane and add “ol”.
2) Number the chain so that the –OH carbon gets the lowest number, e.g. propan-2-ol.
2) Number the chain so that the –OH carbon gets the lowest number, e.g. propan-2-ol.
xiii.What is ester? Write it’s general formula.
(Q-37)Esters are derivatives of carboxylic acids in which the H of –COOH is replaced by an alkyl group. General formula: RCOOR′
