Opt
IiTeachChem
•Created by Opt on 1/28/2025 in #💭│doubts
Series involving binomial coefficients.
59 replies
IiTeachChem
•Created by Opt on 1/16/2025 in #💭│doubts
Binomial theorem/Series
I need help with questions 7 and 18.
How does one solve these? I multiplied (1+x)³⁰ and (1-x)³⁰ for Q7, but got stuck midway. For Q18, I got 0, but the answer is -30C15. Idk where I went wrong.
14 replies
IiTeachChem
•Created by Opt on 1/15/2025 in #💭│doubts
Limits
Let's see if I remember how to type this out.
$\lim_{x \to 0}\frac{cos(sinx)-cosx}{x^4}$
I tried series expansion, and got somewhere, but it didn't work out in the end.
56 replies
IiTeachChem
•Created by Opt on 12/8/2024 in #💭│doubts
Ionic Equilibrium.
Few small doubts.
1. When do we neglect terms like 1±α? How much does it impact the final answer?
2. When do we factor in the contribution of auto-ionisation for calculating pH of a solution?
16 replies
IiTeachChem
•Created by Opt on 6/7/2024 in #💭│doubts
Electronic effects and Reactive Intermediates
I began revising the topic and can someone explain why cyclopropyl methyl carbocations are more stable than benzylic carbocations? There are no π-electrons in the cyclopropyl group to move towards the (+) charge on the methyl like in a phenyl group, so I don't get ir
12 replies
IiTeachChem
•Created by Opt on 6/3/2024 in #💭│doubts
Yes, the answer is marked, but I couldn't figure out the solution.
38 replies
IiTeachChem
•Created by Opt on 5/31/2024 in #💭│doubts
Bredt's Rule
Can someone please explain Bredt's rule for bridgehead atoms? I know the rule itself,
Atoms and lone electron pairs on bridgehead atoms don't participate in reactions as the structure inhibits ion formation. But I do not understand why the ion formation is inhibited and thus, why reactions don't take place at the bridgehead atoms.
15 replies