On reaction with hot conc. $H_2SO_4$,which one of the following compounds loses a molecule of water?

Which $\pi$-bond will be reduced first when the compound shown below undergoes catalytic hydrogenation?

The major product of the reaction given below is

$(CH_3)_2C=C(CH_3)_2 \xrightarrow{\text{Catalyst}, H_2} \text{Number of optical isomers in the product?}$

Which of the following alkenes,on oxidation by $KMnO_4$ in dil. $H_2SO_4$,forms adipic acid?

The major product $[B]$ in the following sequence of reactions is
$CH_3-C(CH(CH_3)_2)=CH-CH_2CH_3$ $\xrightarrow[(i) B_2H_6]{(ii) H_2O_2, OH^{-}} [A]$ $\xrightarrow[\Delta]{dil. H_2SO_4} [B]$