$A$ rather interesting example of the Wolff rearrangement with $2$-diazocyclohexanone in methanol is given below. Identify the major product.

What is the fission of covalent bonds?

Which of the following represent free radical substitution reaction $(FSR)$,electrophilic addition reaction $(EAR)$ and nucleophilic addition reaction $(NAR)$?
$I. CH_3-CH=CH_2 \xrightarrow{Cl_2/CCl_4} CH_3-CHCl-CH_2Cl$
$II. CH_3-CO-CH_3 \xrightarrow{HCN/OH^-} CH_3-C(OH)(CN)-CH_3$
$III. CH_3-CH_2-CH_3 \xrightarrow{Cl_2/h\nu} CH_3-CHCl-CH_3$

In an organic reaction,explain the reactant,substrate,and products obtained. What is the mechanism of the reaction?

Match Column-$I$ and Column-$II$ with the correct relation:

Column-$I$	Column-$II$
$(i)$ Substitution reaction	$(p)$ $CH_2=CH_2 + Br_2 \to CH_2Br-CH_2Br$
$(ii)$ Addition reaction	$(q)$ $C_6H_6 + NO_2^+ \to C_6H_5NO_2 + H^+$
$(iii)$ Electrophilic addition reaction	$(r)$ $CH_3Cl + NaOH \to CH_3OH + NaCl$
$(iv)$ Electrophilic substitution reaction	$(s)$ $CH_3CH_2OH \xrightarrow[\Delta]{Al_2O_3} CH_2=CH_2$
$(v)$ Elimination reaction

In the following reaction,compound $Q$ is obtained from compound $P$ via an ionic intermediate. What is the degree of unsaturation of $Q$?