Question

name the fifth member of alkyne series ?
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Answer 1

Explanation:

Since the first member of alkyne series has 2 carbon atoms in it, therefore, the fifth member of alkyne series will have 6 carbon atoms in it. So, if we substitute n = 6 in the general formula CnH2n – 2 then the molecular formula of the fifth member of the alkyne series will be C6H2 × 6 – 2 or C6H10.

Answer 2

The fifth member of the alkyne series is Hexyne ($C_6H_1_0$).

Explanation:

• The general formula of alkynes is $C_nH_2_n _- _2$ , where n = 2, 3, 4, 5, 6 ...
• For the fifth member of the alkyne series n = 6
• Put n = 6 in the general formula of alkynes is $C_nH_2_n _- _2$
• The fifth member of the alkyne series = $C_6H_2 _\times _6 _- _2$
• The fifth member of the alkyne series = $C_6H_1_2 _-_ 2$

The fifth member of the alkyne series = $C_6H_1_0$

• Hexyne is an unsaturated hydrocarbon consisting of a six-carbon straight chain with a terminal alkyne.
• The molecular formula of Hexyne is $C_6H_1_0$.
• At room temperature, Hexyne is liquid and is pale yellow or colourless.
• Hexyne is used in pharmaceuticals, agrochemicals, and in perfumery industries to produce complex molecules.

Unsaturated hydrocarbons :

• The unsaturated hydrocarbons containing one or more triple bonds are called alkynes. For example, ethyne (C₂H₂), propyne ($C_3H_4$), etc.
• Alkynes have less number of hydrogen atoms as compared to alkanes and alkenes.
• The first 3 members of Alkynes are gases, the next eight members are liquids and the remaining higher members are solids.

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