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Crossed aldol of an aldehyde with formaldehyde, then further steps

This type of question, asked 3 times: 28 Jun 2022, 31 Jan 2023, 23 Jan 2025. All 3 questions below, oldest first.

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  1. Question 1

    28 Jun 2022

    136
    Iso butyraldehyde on reaction with formaldehyde and K2CO3K_{2}CO_{3} gives compound 'A'. Compound ' AA ' reacts with KCNKCN and yields compound ' BB ', which on hydrolysis gives a stable compound ' CC '. The compound ' CC ' is:

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  2. Question 2

    31 Jan 2023

    36
    Propanal and methanal are treated with (i) dil. NaOHNaOH, (ii) heat, (iii) NaCNNaCN and (iv) H3O+H_{3}O^{+} to give product B, C5H8O3C_{5}H_{8}O_{3}. The correct statement for product BB is: it is

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  3. Question 3

    23 Jan 2025

    37
    The major product of the following reaction is : CH3CH2CH=OCH_{3}CH_{2}CH = O →excess HCHOalkalireflux\underset{reflux}{\overset{\begin{array}{r} excess\ HCHO \\ alkali \end{array}}{\rightarrow}}?

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