Alkynes


 
 
Concept Explanation
 

Alkynes

Alkynes:

Those unsaturated hydrocarbons which have one or more triple bonds along with the single bonds are called alkynes. (A triple bond is formed by the sharing of 3 pairs of electrons between 2 carbon atoms). General formula of these compounds isC_nH_{2n-2}.  e.g. if an alkyne have 2 carbon atoms, then its formula is C_2H_{2times2-2}C_2H_2 (ethyne). If there are 3 carbon atoms in the alkyne then its formula must be C_3H_{2times3-2}C_3H_4 (propyne).

Some Facts:

The minimum number of carbon atoms present in an unsaturated compound is 2 because formation of double or triple bonds is possible only between 2 carbon atoms.

Name Molecular  Formula Condensed Formula Structural Formula
Acetylene large C_2H_2
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Sample Questions
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Question : 1

How many triple bonds are present in a compound with a formula C_{2}H_{2}   ?

Right Option : A
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Question : 2

Alkynes contain _____________ hydrogen atoms less than the corrresponding alkenes.

Right Option : B
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Question : 3

The minimum number of carbon atoms present in an unsaturated compound is ____________________.

Right Option : B
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Explanation
 
 


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