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Tautomerism

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Difference between methylene and methenyl

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Q. The equilibrium

p - X y l o q u i n o n e + m e t h y l e n e w h i t e ⇌ o - X y o l h y d r o q u i n o n e + m e t h y l e n e b l u e

may be studied conveniently by observing the difference in color of methylene white and methylene blue. It was then found that 4 percent of the added methylene blue was reduced to methylene white. What is the equilibrium constant of the above reaction? The equation is balanced with one mole each of 4 substances.

Q. The equilibrium,

p -

+

methylene white

\to p -

xylohydroquinone

+

methylene blue, may be studied conveniently by observing the difference in color of methylene white and methylene blue.

One millimole of methylene blue was added to

1

litre of solution that was

0.24 M

p -

xylohydroquinone and

0.012 M

p -

It was then found that

4 %

of the added methylene blue was reduced to methylene white. What is the equilibrium constant for the above reaction? The equation is balanced with one mole each of

4

Q. When propionic acid is treated with aqueous sodium bicarbonate

C O_{2}

is liberated. The ‘C’ of

C O_{2}

Q. Consider the alkane-

{({C H}_{3})}_{2} C H {C H}_{2} C H (C_{2} H_{5}) C H ({C H}_{3}) {C H}_{3}

(i) What is its molecular formula?
(ii) How many

1^{o}, 2^{o}, 3^{o}, 4^{o}

carbon atom are present.
(iii) State the number of methyl, methylene and methane group in the alkane.

Q. The distribution coefficient,

K_{D}

for an organic compound between water and methylene chloride is 3.40. An aqueous solution of the organic compound contains 0.500 g per 100 mL and is extracted with 50.0 mL of methylene chloride. What percentage of the organic compound originally in water is extracted?

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