How many of these carbocations are more stable than primary allyl carbocation?

Which of the following will form only one oxime on reaction with ${\mathrm{NH}}_2\mathrm{OH}$ solution?

Incorrect statement about the compounds $\mathrm{I}, \mathrm{II}$ is

$\left(\mathrm{I}\right)$ 

$\left(\mathrm{II}\right)$ 

$\left(\mathrm{III}\right)$

Which of the following alkenes can generate optically active compounds upon hydrogenation?