Can you delete a song while it's converting into an AAC file on iTunes?

So i don't have a mac and i just hopped on using an iPhone along with iTunes and i have hundreds of songs that are mp3 that need to be converted so grouped them all up (holding Ctrl) right clicked and clicked convert. Now heres the problem i'm tempted to delete all the MP3 versions of songs while they're all highlighted but they're still converting. So should I wait till its done converting or can I delete them now while its converting?

Silver or Space grey iPhone 6?

I originally wanted the gold one but then I changed my mind. Then I wanted the silver one. Today I saw my friend and she got the space grey one. I though that it looked nice. I don't know if I should get silver or space grey?

Added (1). Please list the pros and cons of both.

What is the difference of 540x960 and 640x960?

I have a 540x960 sony xperia m2 and my iPhone has 640x960. The confusing part is that the iPhone can play in hd while the m2 can't. I can still play hd on my m2 on 3rd party apps like viral pro ( youtube won't let me play hd but viral can). So tell me, what is the difference of these resolutions?

Did I get cheated when I bought my iPhone?

I bought my iPhone 5c in January and it came with 5gb of storage. Recently I wad told that it was only releases with 8 gigs, 16gigs, and 32 gigs. Did I get cheated? And yes I checked the storage in the settings and it said 4.53 out of 5 gigs used.

How to change a video quality to how it was before?

For sadies, i'm asking my boyfriend with a video thats a compilation of clips that I've taken on my iphone in the adventures we've had together. My friend made the video for me and she used imovie. I sent her all the clips and she just put it together in one video. But when she sent me the final video, the quality was much worse that the quality of the clips i originally sent her. I don't know why this is but id really like to change it back. Is there any way i can do this?

Why can't i connect to this specific Wi-Fi network?

At my school we have a Wi-Fi network that each of us have our own account to. The accounts were given to us to by the school administration. Anyways a few days ago I had to forget the network, and when I went to rejoin with my same username and password that I used when I first joined the network( it worked for months before I forgot the network) It really confuses me. What happens i I put the username and pass in, then it goes forward to a certificate thing (LBPSB-Radius) Says not verified. To join click accept. I click accept and it says incorrect password and login, even if I know its right. (The emails we use don't have the google address but gives us access to google accounts)
Things I already tried: Restarted my Iphone 4, hard restart, used other friends accounts, reset network settings, tried different combinations of pass/username, ect
Details: network is WPA2 Enterprise, Iphone 4, not activated, normal settings, (no vpn or dns changes, default), no bluetooth, ect
I;m not sure what else to say its just being stubborn. I don;t have access to much outside my account(school)
P.S My phone works on every other Wi-Fi even at other schools and at my house, its just here even when it worked before! The admin said theyll reset my account but I don't think thats the problem, and it takes days. Any ideas? Its important I get access I have a lot of work!