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Pnc Diagonals of a polygon

Hi I was doing pnc and the question was to find no. of diagonals of a polygon with n sides. I thought that since we take a vertex, and form a line with any other vertex except the 2 vertices adjacent to the first one, it should be (n-2)C2 But my sir said it would be nC2-n, which I agree with and know my method was wrong but dont how it was wrong ...

alc phenol

I tried this but ans is 4 , 1 had most alpha hydrogen
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AOD Help

It's part of a question i was solving, why is the maxima coming different with wavy curve (right side) and double derivative (left side).... The double derv ans is correct
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ALC PHENOL

in the solution in Product A SO3H was only at one ortho and 1 para , why SO3H not at both ortho
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pnc

method 2 me 3^5 kese aa gyi??????????????????????????
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alc phenol

In this after first reaction I got PhCCCH3(triple bond btw C) idk how it will react with benzaldehyde Q17
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alc phenol

What's the logic in this ques 7
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coordination small doubt

Does (H2O)6 ligand act as strong field, "only when" there's 4 unpaired electrons in 3d orbital of metal?

CO mot

what he taught me in this slide mujhe kuch samajh nhi aya can anyone help me by explaining or giving me video lecture in which it is taught for slow learners
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GOC Doubt

Which will have more bond length? The one with more extent of resonance or with less extent of resonance and why is it so?...
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Will a reaction still be considered at equillibrium if the rate of forward is significantly more

Lets say we have a reaction in which we have a ton of product of which has slow rate of going backwards and a small amount of reactant with a fast rate of forward. The amount of product formation is equal to amount of reactant formed per unit time and the whole system is at balance. Will it still be considered equillibrium?...

Rotational motion

I solved the question but I had a doubt in the 4th statement isn’t that statement true
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Area under curve

Will this give me the area below x axis too?
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parabola 3

tangent and normal are drawn to x^2-4y-4=0 at P (2root2,1)which intersect y axis at a and b respectively find eqn of circumcircle one approach is to find tangent and normal and form the triangles and find the circle but its long. any other method ?...

Magnetism

How to find torque using coupling forces, not M x B... My couple force concept isn't that clear, i want this question to clear it for me......
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