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41. Calculate the number of sigma bonds in diphenyl ketone.

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42.

Name the following compounds:

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43.

Name the following compounds:

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45.

Draw the structure and write the name of the position isomer of pentan-3-one.

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46. Why is it important to distil out the aldehyde as soon as it is formed by the oxidation of primary alcohol?

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47. What does PCC stand for? Give its composition and one use.

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48. Write the product and name of the following reaction:
Benzyl alcohol + pyridinium chlorochromate

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49.

Complete the following reaction by writing down the major product:

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50.

Complete the following reaction by writing down the major product:

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