a compound gives a yellow ppt on warming with the aquous solution of NaOH . Its vapour density is 29. The compound is
a) CH3CH2CHO
b)CH3COCH3
c)CH3CHOHCH3
d)CH3CH2CH2OH
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Key Idea: (i) First find the molecular weight of compound. (ii) Only aldehydes give yellow ppt. with alkali. Molecular weight=2× vapour density = 2×29= 58 are The compounds having molecular weight 58 are CH2CH2CHO and CH3COCH3 :: Only aldehydes give yellow ppt. with alkali. CH3CH2CHO is the correct answer
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