Doubt from alkyl halde

[Prakhar_2019]

ans given is (a). why cant it be (c) ?

in 36, ans given (b). why cant it be (c) ?
in 37, ans given (a). sholudnt it be (b) ?
in 38, ans given (a). but i am getting (b) please check.

question 53

question 40 , 41. how to do ?

question 49

@pratyaksh_tyagi @Viraam_Rao @Supreeta_Sen @Chirag_Hegde
i know there are many, cause i have lots of doubts in organic chemistry
thanks in advance.

[Supreeta_2019]

Q36 in SN2, transition state has a partial carbocation character. So, the substituent that stabilizes the carbocation the most will react fastest. -OCH3 makes use of it's +M effect, while -CH3 has only +I.
So it's OCH3.

[Prakhar_2019]

but @Supreeta_Sen och3 is in meta position. so how +m effect ?

[Supreeta_2019]

Oh shit didn't see
Yes then it's CH3. @Prakhar_Gupta

[Prakhar_2019]

ok thanks for confirming.

[Supreeta_2019]

40 is given D? @Prakhar_Gupta

[Prakhar_2019]

yes it is (d).
but how and why ? wont be the resulting product unstable ?

[Supreeta_2019]

@Prakhar_Gupta actually the reaction in the question is not complete. The products given in the question are actually intermediate products in Curtius reaction. In the second picture, the third one is your (A) and fourth one is (B). Yes, they will be unstable, but they are intermediates. After completion of the reaction, amine formation happens.

[Prakhar_2019]

oh..didnt know this one.
thanks a lot ! @Supreeta_Sen di

well i must say ..your notes are awesome.

[Supreeta_2019]

anytime