hey! Hope you all are doing alright🙆♀️
I was wondering what was the best approach to this kind of question, because it takes me a while to figure out the reactions.
Also, there was a similar question in the IMAT 2011-Q62
Q 46) Hi!
First, we have the addition of HBr over a double carbon bond. so, it’s an example of addition reaction.
from here we can get rid of answer options A&B as they are mentioning substitution.
Second, we have the substitution of Br with a nitrile. leaving us with answer options C and E.
Lastly, we have the reduction of nitrogen with hydrogen.
You can also see it as we are increasing the number of hydrogen atoms it gotta be reduction.
Hope it helps:)
Q 61).
Let’s see how each answer options can be made from an Ethanol to subsequently reach the conclusion:
A requires elimination.
As we know that Ethanol is a primary alcohol on oxidation it forms an aldehyde and on subsequent oxidation it turns into an acid so we can remove answer options B&C as they are wrong.
D requires dehydration.
E however can be done by substitution.
If it were Ethene then by addition of bromine we would have formed bromoethane.
Hope it helps:)
Thank you so much Ujjwal for claryfing these questions
I have one doubt, how did you know that it required dehydration? 
Hi!
There’s a reaction involving this conversion.
CH3 CH2 OH in presence of conc. H2SO4 which is a strong dehydrating agent gives us CH3-CH2-O-CH2-CH3(ethoxyethane).
Hope it helps:)
ohhh Okay! Thank you sooo much
