Q.

Phenol is treated with Na2Cr2O7/H2SO4 to give a compound ‘X’. Number of pi bonds between carbon atoms per molecule of ‘X’ are

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a

3

b

4

c

6

d

2

answer is D.

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Detailed Solution

‘X’ is para benzoquinone;It has four pi bonds, two C=C and two C=O bonds;
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Phenol is treated with Na2Cr2O7/H2SO4 to give a compound ‘X’. Number of pi bonds between carbon atoms per molecule of ‘X’ are