1) Which of the following reactions would result in formation of a carboxylic ac

Question

1) Which of the following reactions would result in formation of a carboxylic acid?

a)       B and   D
b)       D   only
c)       A only
d)       A,   B,   and   D

2)   How many different stereoisomers would be formed in the following reaction?

a)   1
b)   2
c)   3
d)   4

3) Which   set   of   reagents   could   be   used   in   the   reaction   below?

a)       LiAlH4 then   Br2
b)       NaBH4 then   HBr
c)       PBr3 then   HBr

d)       LiAlH4 then   PBr3

4)    Which of the following products would be produced from Swern oxidation of molecule 1 below?

a)       A
b)       B
c)       D
d)       No   reaction   occurs

1) Which of the following reactions would result in formation of a carboxylic acid? a) A b) B c) D d) No reaction occurs a) LiAlH4 then Br2 b) NaBH4 then HBr c) PBr3 then HBr d) LiAlH4 then PBr3 4) Which of the following products would be produced from Swern oxidation of molecule 1 below? a) 1 b) 2 c) 3 d) 4 3) Which set of reagents could be used in the reaction below? a) B and D b) D only c) A only d) A, B, and D 2) How many different stereoisomers would be formed in the following reaction?

Explanation / Answer

1 (B) Oxidation of a secondary alcohol with acidified sodium dichromate gives carboxylic acid.

2. Two stereoisomers (a pair of enantiomers ) will be formed.

3. The reagents used are b)       NaBH4 then   HBr.

4. The product will be the option c) i.e the product     D

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