Chemistry-
General
Easy
Question
The correct order of reactivity towards electrophilic substitution is
- Benzoic acid > chlorobenzene > benzene > phenol
- Benzoic acid > phenol > benzene > chloro benzene
- Phenol > benzene > chlorobenzene > benzoic acid
- Phenol > chlorobenzene > benzene > benzoic acid
The correct answer is: Phenol > benzene > chlorobenzene > benzoic acid
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Iodine Titration
All such titration which involves the direct titration of Iodine with a reducing agent are grouped under Iodimetry. Iodimetry is employed to determine the strength of reducing agent such as sodium those sulphate
I2 + Na2S2O3 ¾→ I– + null
If iodine is liberated as a result of chemical reaction involving oxidation of an idodide ion by a strong oxidizing agent in neutral or acidic medium the liberated iodine is then titrated with reducing agent. Iodometry is used to estimate the strength of oxidizing agent.
For example the estimation of Cu++ with thiosulphate.
Cu++ + I– ¾→Cu2I2 + I2
I2 + null
Starch used as indicator near the end point which form blue colour complex withnull. The blue colour disappears when there is no more of free I2.
100 ml of 0.1 N hypo decolourised iodine by the addition of x g of crystalline blue vitriol to excess of KI. The value of x is
Iodine Titration
All such titration which involves the direct titration of Iodine with a reducing agent are grouped under Iodimetry. Iodimetry is employed to determine the strength of reducing agent such as sodium those sulphate
I2 + Na2S2O3 ¾→ I– + null
If iodine is liberated as a result of chemical reaction involving oxidation of an idodide ion by a strong oxidizing agent in neutral or acidic medium the liberated iodine is then titrated with reducing agent. Iodometry is used to estimate the strength of oxidizing agent.
For example the estimation of Cu++ with thiosulphate.
Cu++ + I– ¾→Cu2I2 + I2
I2 + null
Starch used as indicator near the end point which form blue colour complex withnull. The blue colour disappears when there is no more of free I2.
100 ml of 0.1 N hypo decolourised iodine by the addition of x g of crystalline blue vitriol to excess of KI. The value of x is
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Identify the least stable ion amongest of the following :
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Physics-General
