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The missing structures A and B in the r...

The missing structures `A` and `B` in the recation sequence:
`R -CH_(2)-CH_(2)OH overset(AI(2)O_(3))underset(350^(@)C)rarrR-CH=CH_(2)overset((i)O_(3))underset((ii)Zn//H_(3)O)rarr`
`RCHO +A, RCHO overset(Reduct)rarrB`, are

A

`CH_3OH,RCOOH`

B

Methanal , `RCH_2OH`

C

Ethanal , RCOOH

D

Methanal , RCHOHR

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The correct Answer is:
B
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