The correct order of the stability of the following compounds based upon hyperconjugation is

The order of circled $\mathrm{C}-\mathrm{H}$ bond dissociation energy in the following compound is

The correct order of the relative stability of the following carbanions is

I. $\mathrm{HC} \equiv \mathrm{C}^{-}$

II. $\mathrm{CH}_2=\mathrm{CH}-\mathrm{CH}_2^{-}$

III. $\mathrm{H}_2 \mathrm{C}=\mathrm{CH}^{-}$

IV. $\left(\mathrm{C}_6 \mathrm{H}_5\right)_2 \mathrm{CH}^{-}$

$$ \text { Identify the correct decreasing order of acidic strength. } $$