$\left(C_{6} H_{5}\right)_{3} \dot{C}>\left(C_{6} H_{5}\right)_{2} \dot{C} H>\left(C H_{3}\right)_{3} \dot{C}>\left(C H_{3}\right)_{2} \dot{C} H$
The stabilisation of first two is due to resonance and last two is due to inductive effect.
$(1) H_3C - C = C⊝\,(2) H - C = C⊝ \,(3) $ ${H_3}C\,\, - \,\,\mathop C\limits^\Theta {H_2}$
$1.$ $HCHO$
$2.$ $ CH_3COCH_3$
$3.$ $PhCOCH_3$
$4.$ $PhCOPh$
$CH_3 - CH_3, CH_3 - CH_2 $$- CH_3, (CH_3)_2CH - CH_3,$
$ CH_3 - CH_2 - CH(CH_3)_2.$
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