(C)\[{{R}_{2}}C\equiv \overset{\Theta }{\mathop{C}}\,H\] (D)\[{{R}_{3}}C-\overset{\Theta }{\mathop{C}}\,{{H}_{2}}\] is in the order of
A) (1) > (2) > (3) > (4)
B) (2) > (3) > (4) > (1)
C) (4) > (2) > (3) > (1)
D) (1) > (3) > (2) > (4)
Correct Answer: A
Solution :
Key Idea: When s-character increases, then electrons becomes more closer to the nucleus and structure is of lower energy and is more stable The stability order of carbanions is as: \[RC\equiv {{C}^{\Theta }}>{{C}_{6}}H_{5}^{\Theta }>{{R}_{2}}C=\overset{\Theta }{\mathop{C}}\,H>{{R}_{3}}C-\overset{\Theta }{\mathop{C}}\,{{H}_{2}}\]
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