In benzene,the $C-C-C$ and $C-C-H$ bond angles are.........

Write down the products of ozonolysis of $1,2-$dimethylbenzene ($o-$xylene). How does the result support the Kekul\text{é} structure for benzene?

According to $H$ückel's rule, a cyclic $\pi$-molecular orbital system must contain which of the following to be aromatic?

Which of the following is formed as a result of biological oxidation of benzene in the body of the dog?

What is produced when benzene is alkylated with $n$-propyl chloride in the presence of anhydrous $AlCl_3$?

When acetylene is passed through a red hot iron tube,compound $X$ is formed. Which one of the following reactions will yield $X$ as the major product?