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Why, in the bromination of phenols, do you not need an acid catalyst like you do in the bromination of benzene?

Benzene's delocalised π electrons means that it is not very nucleophilic and so cannot polarise a neutral molecule and produce the required electrophile. As a result it require a catalyst to form the electro...
SA
Answered by Sian A. • Chemistry tutor
8282 Views

Find the stationary points of the function z = 3x(x+y)3 - x3 + 24x

z = 3x(x+y) 3 - x 3 + 24xDifferentiating partially with respect to x and with respect to y:∂z/∂x = 3(x+y) 3 + 9x(x+y) 2 - 3x 2 + 24∂z/∂y = 9x(x+y) 2 At stationary points: ∂z/∂x = 0 and ∂z/∂y = 0.From ∂z/∂y =...
HT
2599 Views

“Both Scott Fitzgerald’s ‘The Great Gastby’ and Joshua Ferris’ ‘Then We Came to the End’ act as criticisms of capitalism.’” Do you agree with the statement?

Furthermore, through their presentation of the divine ‘The Great Gatsby’ and ‘ Then We Came to the End’ act as criticisms or capitalism. There is a clear correlation between the Western world embracing capit...
CH
4723 Views

How do I use the quadratic formula?

example quadratic eqn: ax 2 +bx+c=0 => x = (-b+-(b 2 -4ac) 1/2 )/2a e.g. 4x 2 -13x+3/4=0 x= (13+-(157) 1/2 )/8 = 3.1912, 0.0588
BB
Answered by Ben B. • Maths tutor
3347 Views

Integrate cos^2A

Integrating sin^2A and cos^2A is a bit nasty so we can use double angle formula to make it a little simpler. cos2A = cos^2A - sin^2A = 2cos^2A - 1. We can rearrange to get cos^2A in nicer terms. cos^2A = 1/2...
RM
Answered by River M. • Maths tutor
5156 Views