Which of the following compound will have the least basic strength?

C H_{3} - C H_{2} - C \equiv C^{-}

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C H_{3} - C H_{2} - C H = - C H

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C H_{3} - C H_{2} - C H_{2} - - C H_{2}

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All have equal basic strength.

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Solution

The correct option is A $C H_{3} - C H_{2} - C \equiv C^{-}$
$Basic strength \propto \frac{1}{% s character}$
In $A$ : Hybridisation is $s p$ . $% s$ character is $50 %$
In $B$ : Hybridisation is $s p^{2}$ . $% s$ character is $33.3 %$
In C : Hybridisation is $s p^{3}$ . $% s$ character is $25 %$
More the $s -$ character more is the electronegativity, and more stable the negative charge, so less will be the basic strength.

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