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Chemistry: Post your doubts here!

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It would be C. Since there're no H-Bonds in aldehyde (ethanal is an aldehyde), so there won't be any sharp and broad peak b/w 2500–3300 cm–1 OR b/w 3230–3550 cm–1 which are caused by Carboxylic acid and Alcohol groups respectively. In C, there's a sharp, narrow peak at 1680–1750 cm–1 which is characteristic of aldehydes, because they don't have H-Bonds. So C represents this given aldehyde.
 
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Ohkay. Let's see. :p
I don't seem to find that :/ In the mean time, solve this :p

screen-shot-2016-02-23-at-8-02-20-pm-png.59448
 
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J13 QP 51
1) a) ii)
Whats the ideal way to draw the graph?
The ER says The correct prediction of a straight line or curve of negative gradient with no plateau was given by many and received credit. How do I draw such curve without a plateau? I always drew mine with a plateau
 
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