The hottest region of the Bunsen flame shown in the figure below is:

Which of the following reactions does not represent the major product correctly?

The product of the above reaction will be:

If the heat of hydrogenation of $1$-butene is $30 \ kcal$,what is the heat of hydrogenation of $1,3$-butadiene (in $kcal$)?

The state of hybridisation of $C_2, C_3, C_5$ and $C_6$ of the hydrocarbon $CH_3-C_6(CH_3)_2-C_5H=C_4H-C_3H(CH_3)-C_2 \equiv C_1H$ is in the following sequence:

In the given sequence of reactions,identify $P, Q, R$ and $S$ respectively.
$CH_2=CH_2 + Br_2$ $\xrightarrow{P} CH_2(Br)-CH_2(Br)$ $\xrightarrow{Q} CH_2=CH-Br$ $\xrightarrow{R} CH \equiv CH$ $\xrightarrow{S} C_6H_6$