The structure of hydrogen sulphide (Mr = 34.1 g mol-1
1 answer:
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The strategy adopted for for the synthesis of <span>2-bromo-4-nitrobenzoic acid is as follow,
1) First Nitration of Toluene was done because the product formed (4-Nitrotoluene) will direct the next incoming electrophile (i.e. -Br) to ortho position with respect to -CH</span>₃ (ortho para directing) and at meta position with respect to -NO₂ (meta directing).
2) Bromination gave the exact desired product as discussed in point 1.
3) At last oxidation of toluene yield benzoic acid. No other substituent is oxidized other than -CH₃ group.
1) First Nitration of Toluene was done because the product formed (4-Nitrotoluene) will direct the next incoming electrophile (i.e. -Br) to ortho position with respect to -CH</span>₃ (ortho para directing) and at meta position with respect to -NO₂ (meta directing).
2) Bromination gave the exact desired product as discussed in point 1.
3) At last oxidation of toluene yield benzoic acid. No other substituent is oxidized other than -CH₃ group.
Answer:
275.3 nm is the wavelength of light required for mercury.
Mercury can not be used to generate electricity from the sun because wavelength at which mercury will emit an electron is smaller than 500 nm.
Explanation:
The wavelength of light required for mercury to emit an electron.
The wavelength of the radiation =
Energy required fro mercury to to emit an electron = E
Energy required fro mercury to to emit an electron will the energy if the radiation = E' =
E' = E
To calculate the wavelength of light, we use the equation:
where,
= wavelength of the light
h = Planck's constant =
c = speed of light =
Wavelength of the sun light in the visible region = 500 nm
500 nm > 275.3 nm
Less energy < more energy
So, this means that mercury can not be used to generate electricity from the sun.