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Published on: 04/07/2021
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Questions + Answers key
Take MCQ Science Test1.
Write the IUPAC rules for naming organic compounds.
2.
Tabulate the organic compounds based on functional group.
3.
Fill in the blanks
| No. of Carbon atoms | Alkane | Alkene | Alkyne |
| i | Methane (CH4) | ||
| ii | ___________(C2H6) | Ethene (C2H4) | ________(C2H2) |
| iii | Propane (C3,H8) | _________(C3H6) | _________(C3H4) |
| iv | Butane (C4H10) | _________(C4H8) | Butyne (C4H6) |
| v | ________(C5H12) | Pentene (C5H10) | Pentyne (C5H8) |
4.
Draw the flow chart of classification of organic compounds.
5.
CH3-CH2-CH2-CH2 -CH3
1.
Rule 1: Identify the longest chain of carbon atoms to get the parent name.
Rule 2: Number the Carbon atoms of the parent chain, beginning at the closest end of the substituent or functional group. They are called Locant numbers. If both functional group and substituent are present, then the priority will be given to the functional group.
Rule 3: In case of alkenes and alkynes, locate the double bond or triple bond and use its locant number followed by a dash and a primary suffix.
Rule 4: If the compound contains functional group, locate it and use its locant number followed by a dash and a secondary suffix.
Rule 5: When the primary and secondary suffixes are joined, the terminal 'e’ of the primary suffix is removed.
Rule 6: Identify the substituent and use a number followed by a dash and a prefix to specify the location and identity.
2.
| Class of Compound | Functional Group | Common Formula | Examples |
| Alcohols | - OH | R- OH | CH3CH2OH Ethanol |
| Aldehydes | \(\underset{-C- H }{\overset{O}{||}}\) | R- CHO | CH3CHO Acetaldehyde |
| Ketones | \(\underset{-C-}{\overset{O}{||}}\) | \(\underset{R-C-{R}^{1}}{\overset{O}{||}}\) | CH3COCH3 Acetone |
| Acids | \(\underset{-C-OH}{\overset{O}{||}}\) | R — COOH | CH3COOH Acetic Acid |
| Ester | \(\underset{-C-OR}{\overset{O}{||}}\) | R -—COOR1 | CH3COOCH3 Methyl acetate |
| Ether | - O - R | R-O- R1 | CH3-O-CH3 Dimethyl Ether |
3.
| No. of Carbon atoms | Alkane (CnH2n+2) | Alkene (CnH2n) | Alkyne (CnH2n-2) |
| i | Methane (CH4) | ||
| ii | Ethane(C2H6) | Ethene (C2H4) | Ethyne(C2H2) |
| iii | Propane (C3,H8) | Propene (C3H6) | Propyne (C3H4) |
| iv | Butane (C4H10) | Butene(C4H8) | Butyne (C4H6) |
| v | Pentane(C5H12) | Pentene (C5H10) | Pentyne (C5H8) |
4.
5.
Step 1: It is a five- carbon chain and hence the root word is ‘Pent’. (Rule 1)
Step 2: All the bonds between carbon atoms are single bonds, and thus the suffix is ‘ane’. So, its name is Pent + ane = Pentane
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Tamilnadu Stateboard 10th Standard Subjects
Tamilnadu Stateboard Standards
