what is the formulae of pyridinium chlorochromate

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Q. An organic compound

X

on treatment with pyridinium chlorochromate (PCC) in

C H_{2} C l_{2}

gives compound

Y .

Compound

Y

reacts with

I_{2} / N a O H

to form iodoform. The compound

X

is:

$C H_{3} C H_{2} O H$ can be converted into $C H_{3} C H O$ by . . . .
(a) catalytic hydrogenation
(b) treatment with $L i A I H_{4}$
(c) treatment with pyridinium chlorochromate
(d) treatment with $K M n O_{4}$

Which of the following reagents can be used to oxidise primary alcohols to aldehydes?
(a) $C r O_{3}$ in anhydrous medium
(b) $K M n O_{4}$ in acidic medium
(c) Pyridinium chlorochromate
(d) Heat in the presence of Cu at 573K

0.25 M

solution of pyridinium chloride

C_{5} H_{5} N H C l

was found to have a

p H

2.699

. What is

K_{b}

for

C_{5} H_{5} N

A 0.02 M solution of pyridinium hydrochloride has pH = 3.44. Calculate the ionization constant of pyridine

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