Qur'an Contradiction: Can Angels Disobey?

About the angels: For NONE are arrogant (before their Lord). They ALL fear their Lord, high above them, and they do ALL they are commanded. -- Sura 16:49-50

And behold, we said to the ANGELS: "Bow down to Adam". And THEY bowed down, EXCEPT Iblis. He refused and was haughty. -- Sura 2:34

hi
this is to answer:
--Can angels disobey? 

--"iblis" is not from "mala'eka" (angles), but a "jin"
 according to the exact quote of quran (18:50), and "jin"s
 do have free will, unlike "mala'eka" (angles).
 all the angles did bow down to adam, again according to
 the exact quote of quran (15:30 and 38:73). 
 here is an explanation about why usually, and mistakenly
 in my opinion, "iblis" is considered as if he is an angle
 or as if he was ordered to bow down to adam too.
 the story says: god orders "angles" to bow down to adam (not 
 "iblis"! he isn't included. but he was a member of god's
 court and therefore present during this scenario), they "all"
 do, and "iblis" refuses. this "refusal" is not, by itself,
 the reason that god rejected him from himself, after all he
 was not included in the given order. but his explanation,
 when he reveals his racist nature (he is from "smokeless fire"
 and adam from "mud", so considers himself higher), then god
 rejects him from his court.

shaahin