Which bond is stronger between the single bond $C-C$ of an alkane and the double bond $C=C$ of an alkene?

$CH_3-CH(CH_3)-CH_3$ $\xrightarrow{KMnO_4} (A)$ $\xrightarrow[\Delta]{H^{+}} (B)$ $\xrightarrow[ROOR]{HBr} (C)$
Product $(C)$ in the above reactions is:

How many $\sigma$ and $\pi$ bonds are present in the following?
$(a)$ $But-1-ene-3-yne$
$(b)$ $Buta-1,3-diene$
$(c)$ $CH_2=CH-C\equiv N$
$(d)$ $Propa-1,2-diene$
$(e)$ $1-butyne$ and $2-butane$

The product $(A)$ of the given reaction is:

In the hydrocarbon,$CH_3(1) - CH(2) = CH(3) - CH_2(4) - C(5) \equiv CH(6)$,the state of hybridization of carbons $1, 3$ and $5$ are in the following sequence:

The increasing order of carbon-carbon bond length for the following is: