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