1. Treatment of 2-hexanone with potassium dichromate in sulfuric acid will give
ID: 832680 • Letter: 1
Question
1. Treatment of 2-hexanone with potassium dichromate in sulfuric acid will give which of the following products?
a) hexanol
b) hexanal
c) hexanoic acid
d) unreacted 2-hexanone will be recovered
2. Which of the following is obtained by the reaction of 2-butanone with H2 in the presence of a transition metal catalyst?
a) 1-butene
b) 2-butene
c) 1-butanol
d) 2-butanol
3. Which type of biologically important molecules includes many cyclic hemiacetals?
a) proteins
b) lipids
c) none of these
d) carbohydrates
4. Which of the following can undergo keto-enol tautomerism?
a) 2-methylpentanal
b) 2,2-dimethylbutanal
c) both (a) and (b)
d) neither (a) nor (b)
a) hexanol
b) hexanal
c) hexanoic acid
d) unreacted 2-hexanone will be recovered
Explanation / Answer
1) Ans: d)
Ketones don't have that particular hydrogen atom ( unlike aldehydes), they are resistant to oxidation. Only very strong oxidising agents like potassium manganate(VII) solution (potassium permanganate solution) oxidise ketones - and they do it in a destructive way, breaking carbon-carbon bonds.
2) Ans: d)
we know that the C=C double bond of an alkane can reduced by hydrogen in the presence of a transition metal catalyst (such as platinum) to a C- C single bond. The same is true of the C=O double bond of an aldehyde or ketone to the C-O. Aldehydes are reduced to primary alcohols and ketones are reduced to secondary alcohols
3) Ans : d)
Stable cyclic hemiacetals and hemiketals, called lactols,can be readily formed, especially when 5- and 6-membered rings are possible. In this case an intramolecular OH group reacts with the carbonyl group. Glucose and many other aldoses exist as cyclic hemiacetals
4) Ans. a)
In organic chemistry, keto
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