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Question

In which of the following reactions product will be aldehyde?

A
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B
CH3CH2CH2OHPCC in CH2Cl2−−−−−−−−
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C
CH3CCHH2SO4−−−HgSO4
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D
Both (a) and (b)
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Solution

The correct option is D Both (a) and (b)
(a) Ozonolysis of alkenes involves the addition of an ozone molecule to an alkene, to form an ozonide. Formed ozonide undergoes cleavage by Zn/H2O to give smaller oxidised product. but-2-ene undergo ozonolysis to give ethanal.(b) PCC(Pyridinium chlorochromate) is a mild oxidizing agent. It converts 1o alcohols to aldehydes and 2o alcohols to ketones, but is not strong enough to convert primary alcohols to carboxylic acids.
CH3CH2CH2OHPCC in CH2Cl2−−−−−−−−
(c) The hydration of propyne gives acetone.
CH3CCHH2SO4−−−HgSO4CH3COCH3
Hence option (a) and (b) will give aldehyde.

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