Base strength of [AIPMT (S) 2008] |
(1) \[{{H}_{3}}C\overset{\Theta }{\mathop{C}}\,{{H}_{2}}\] |
(2) \[{{H}_{2}}C=\overset{\Theta }{\mathop{C}}\,H\]and |
(3) \[H-C\equiv \overset{\Theta }{\mathop{C}}\,\] is in the order of |
A) (2) > (1) > (3)
B) (3) > (2) > (1)
C) (1) > (3) > (2)
D) (1) > (2) > (3)
Correct Answer: D
Solution :
Key Idea: Stronger the acid, weaker is its conjugate base. |
The strength of their conjugate acids are in the order: \[HC\equiv CH>{{H}_{2}}C=C{{H}_{2}}>C{{H}_{3}}-C{{H}_{3}}\] |
Therefore, the correct order of strength of their conjugate base is: |
\[C{{H}_{3}}C{{H}_{2}}^{\Theta }>{{H}_{2}}C=\overset{\Theta }{\mathop{C}}\,H>HC\equiv \overset{\Theta }{\mathop{C}}\,\] |
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