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    $\begingroup$ @JamilAhmed The problem is that the first carbon atom in propanal is already almost full, so it cannot have two more functional groups. $\endgroup$
    – DHMO
    Commented Sep 2, 2016 at 15:09
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    $\begingroup$ @JamilAhmed Does your exercise look like Exercise I, Q.4 on page 7 of this pdf document? tekoclasses.com/IITJEE%20CHEMISTRY%20%20ENGLISH/… $\endgroup$
    – user7951
    Commented Sep 2, 2016 at 15:23
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    $\begingroup$ @Loong, Q.4 exactly. $\endgroup$
    – Jamil Ahmed
    Commented Sep 2, 2016 at 15:32
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    $\begingroup$ @JamilAhmed Then the answer is not A. It is not 1,1-diformyl propanal. Problem solved? $\endgroup$
    – DHMO
    Commented Sep 2, 2016 at 15:49