An organic compound $C_4H_6$ on ozonolysis gives $HCHO$,$CO_2$,and $CH_3CHO$. The compound will be:

Which bond is stronger between the single bond $C-C$ of an alkane and the double bond $C=C$ of an alkene?

What is the correct order of bond dissociation energy for the following $C-H$ bonds?
$I. \, CH_3-H$
$II. \, CH_3CH_2-H$
$III. \, CH_2=CH-CH_2-H$
$IV. \, C_6H_5-H$

Which of the following reactions results in the formation of a pair of diastereomers?

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:

To achieve the above conversion,the reagents used will be