Name the distinguishing reaction of an alkane from an alkene.

What is the product obtained from the dehydration of glycerol?

Which of the following will give a mixture of $cis$ and $trans-1,4-$dimethylcyclohexane upon catalytic hydrogenation?

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

The dibromo compound $[P]$ (molecular formula : $C_{9}H_{10}Br_{2}$) when heated with excess sodamide followed by treatment with dilute $HCl$ gives $[Q]$. On warming $[Q]$ with mercuric sulphate and dilute sulphuric acid yields $[R]$ which gives positive Iodoform test but negative Tollen's test. The compound $[P]$ is:

The number of sigma and pi bonds in $but-1-ene-3-yne$ are