Ozonolysis of $but-1-ene$ followed by hydrolysis gives:

Identify the product $C$ in the following reaction sequence:
$CH_3CH_2C \equiv CH + HCl \to B \xrightarrow{HI} C$

Isopropyl alcohol is obtained by reacting which of the following alkenes with conc. $H_2SO_4$ and $H_2O$?

The product $6-$oxoheptanal is formed by the reductive ozonolysis of:

$CH_3-CH=CH_2 \xrightarrow{HBr} \text{Major product } (A). \text{ } A \text{ is:}$

Given below are two statements.
Statement $I :$ The presence of weaker $\pi$-bonds makes alkenes less stable than alkanes.
Statement $II :$ The strength of the double bond is greater than that of carbon-carbon single bond.
In the light of the above statements,choose the correct answer from the options given below.