Question

Which of the following order is correct regarding acidic character of hydrocarbons given below?
I. `CH-=CH gt CH_(2) gt CH_(3)-CH_(3)`
II. `HC-=CH gt CH_(3)C-= CH gt gt CH_(3)C-=C CH_(3)`
A. Only I
B. Only II
C. Both I and II
D. None of these

Answer 1

Correct Answer - C
Both are correct. In (i) 1s-character defines correct trend to acidic strength as acidic strength `prop %` s-character
In (ii) inductive effect defines acidic strength and polarity of C-H bond of alkyne. Group having +l- effect increases electron density around C-H bond hence decreases polarity and acidic strength of alkyne.