| 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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