With oxalic acid,glycerol at $260\,^\circ C$ gives

Consider the following statements: $A$ hydrocarbon of molecular formula $C_5H_{10}$ is a
$I.$ monosubstituted alkene
$II.$ disubstituted alkene
$III.$ trisubstituted alkene
Which of the following statement$(s)$ is(are) correct?

Which of the following reacts with $KMnO_4$ but does not react with $AgNO_3$?

Acid-catalyzed hydration of alkenes,except ethene,leads to the formation of:

The compounds that will give an isomer of $2,2$-dimethylpropane on catalytic hydrogenation are:
$(1)$ $CH_3-CH=C(CH_3)_2$
$(2)$ $CH_3-CH=CH-CH_3$
$(3)$ $CH_3-CH=CH-CH_2-CH_3$
$(4)$ $CH_3-C(CH_3)=C(CH_3)-CH_3$

The reaction of $HBr$ with the following compound would produce: