Alkanes are comprised of a series of compounds that contain carbon and hydrogen atoms with single covalent bonds. The alkanes, alkenes and cycloalkanes are examples of homologous series. A homologous series is a group of chemicals which have similar chemical properties and can be represented by a general formula. The simplest family of compounds are called alkanes. This group of compounds consists of carbon and hydrogen atoms with single covalent bonds. Two consecutive number of 2nd and 3rd member of homologous series . Alkanes that have 5 or more carbons are named using prefixes that indicate the number of carbons. Also, comprises a homologous series having a molecular formula of C n H 2n+2. These MCQs contains all the important questions from latest NCERT textbooks and are useful for all the students following NCERT Books. C 6 H 6, C 2 H 6, C 2 H 4, C 3 H 4. As a consequence, the first four members of the alkane homologous series are gases at room temperature, like ethane & propane. Those with 5 to 16 carbon atoms per molecule are liquids like octane & oils. Alkynes may consider as an unsaturated hydrocarbon. CH3CH2C- CH (2-Brutyne) n is 4 . The first member of alkyne series is ethyne with two carbon atoms bonded by a triple bond; H C ≡ C H. Answered By . The first four names come from the names methanol, ether, propionic acid, and butyric acid. Learn More. Write the name and molecular formula of the first member of the homologous series of alkynes. This group of compounds is a homologous series with the general molecular formula of C n H 2 n‐‐2 , where n equals any integer greater than one. Explanation. 4) They show a regular gradation in their physical properties (see the table-1). The general formula of homologous series whose first member is ethyne is . The general formula for the homologous series of alkanes is C n H 2n+2 where n is the number of carbon atoms. asked Jul 12, 2018 in Chemistry by Anukriti bharti ( 38.1k points) carbon and its compounds The first member of the alkyne homologous series is (a) propyne (b) ethyne (c) methane (d) ethene. Fill in the blanks: The first member of homologous series among alkynes is _____. CH3-CH ( Propyene) n is 3. Which of the following belongs to homologous series of alkynes? Hence the molecular formula is. (a) C 6 H 6 (b) C 2 H 4 (C) C 2 H 6 (d) C 3 H 4. So, pent- means 5, hex- means 6, hept- means 7, and so on. The rest (very long chain alkanes) will be solids like waxes & tar. C3H4 and C4H6 . Give the molecular formula. The molecular formula of the third and the fifth members of homologous series of alkynes: Third member of alkyne series: C 4 H 6 (butyne) Fifth member of alkyne series: C 5 H 8 (pentyne) (it has two isomer and name will depend on isomer.) Occurrence In nature, methane is formed by the microbial activity of organic matter. The first four alkanes in the homologous series retain their original names. Molecular shape also influences the strength of dispersion forces. 2) Successive compounds in the series possess a difference of (-CH2) unit. CnH2n-2. After these the names are formed by adding the ending -ane to the Greek word for the number of carbon atoms in the molecule. Question 31. All alkanes end in, “ane”. Answer (b) ethyne. The alkynes comprise a series of carbon‐ and hydrogen‐based compounds that contain at least one triple bond. Question 30. Answer (d) C 3 H 4. Class 10 Science Chapter 4 MCQ (Multiple Choice Questions) of Carbon and its Compounds. brainly.in/question/16721209 The general formula for homologous series of alkynes is {eq}{C_n}{H_{2n - 2}} {/eq}, where n represents the number of carbon atoms.
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