Which of these compounds will give a yellow precipitate when treated with alkaline aqueous iodine?

Which of the infrared spectra is that of butanone and which one is of butan-$2$-ol? 

Explain the reasoning for infrared spectra. Why infrared spectra 'A' is of butan-$2$-ol and 'B' is of butanone?

Name the following compound:

${\mathrm{CH}}_3{\mathrm{COCH}}_3$

Name the following compound:

${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{OH}$

Name the following compound:

${\mathrm{CH}}_3\mathrm{CHO}$

Name the following compound:

${\mathrm{CH}}_3\mathrm{CH}\left(\mathrm{OH}\right){\mathrm{CH}}_3$

Name the following compound:

${\mathrm{CH}}_3{\mathrm{COCH}}_2{\mathrm{CH}}_3$

Name the following compound:

${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{CHO}$