Aqueous solution of sodium salt of $2-$methylbutanedioic acid on Kolbe's electrolysis gives:

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.

Unsaturation in organic compounds is detected by ...........

The given reaction represents the ozonolysis of an alkene $A$. Identify $A$ and the product $B$ in the following reaction sequence:
$A + O_3$ $\rightarrow \text{ozonide intermediate}$ $\xrightarrow{Zn + H_2O} B + HCHO$

Which of the following alkenes yield $3-$bromo$-3-$methylpentane as the major product upon addition of $HBr$?
$(I)$ $3-$methylpent$-2-$ene
$(II)$ $3-$methylpent$-2-$ene (isomer)
$(III)$ $3-$ethylpent$-1-$ene
$(IV)$ $3-$methylpent$-1-$ene

In organic reactions, sodium in liquid ammonia is used as: