First slide

Alkynes

Question

Which of the following compound contain most electronegative carbon atom?

Moderate

A

${CH}_{3} - {CH}_{3}$
B

${CH}_{2} = {CH}_{2}$
C

$CH \equiv CH$
D

${CH}_{4}$

Solution

Step - 1
Electronegativity of carbon atom depend upon the % s-character.
More the % s-character more is the electronegativity of carbon atom.
Step - 2
in option (1) CH₃-CH₃ two carbons are SP³
% s-character is 25%.
Step - 3
in option (2) CH₂=CH₂ two carbons are SP²
% s-character is 33%.
in option (3) $CH \equiv CH$ two carbons are SP
% s-character is 50%.
it contains more electronegative carbon atoms.
[Step 5]:
in option (4) ${CH}_{4}$ carbon is SP³
% s-character is 25%.

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