Question
Explain Van't Hoff factor.
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Write the equations of the following reactions:
(i) Friedel-Crafts acetylation of benzene.
(ii) Gattermann-Koch aldehyde synthesis.
(iii) Gattermann aldehyde synthesis.
(i) Friedel-Crafts acetylation of benzene.
(ii) Gattermann-Koch aldehyde synthesis.
(iii) Gattermann aldehyde synthesis.
The electrical resistance of a column of 0.05 M KOH solution of diameter 1 cm and length 45·5 cm is 4.55 $\times$ 103 ohm. Calculate its molar conductivity.
→- Deficiency of which vitamin causes rickets?
- Give an example for each of fibrous protein and globular protein.
- write the product formed on reaction of D-glucose with Br, water.
An organic compound A, which has a characteristic odour, on treatment with con.NaOH forms two compounds B and C. Compound B has molecular formula C7H8O which on oxidation gives back A. Compound C is the sodium salt of an acid. C, when heated with soda lime yields an aromatic hydrocarbon D. Deduce the structures of A, B, C and D.
Although +3 oxidation states is the characteristic oxidation state of lanthanoids but cerium shows +4 oxidation state also. Why?
How would you account for the following:
i. Phenols are much more acidic than alcohols.
ii. The boiling point of ethers are much lower than those of the alcohols of comparable molar masses.
i. Phenols are much more acidic than alcohols.
ii. The boiling point of ethers are much lower than those of the alcohols of comparable molar masses.
Explain the following:
Haloalkanes react with KCN to form alkyl cyanides as main product while AgCN forms isocyanides as the major product.
Haloalkanes react with KCN to form alkyl cyanides as main product while AgCN forms isocyanides as the major product.
How would you account for the following situations?
- The transition metals generally form coloured compounds.
- With 3d4 configuration, Cr2+ acts as a reducing agent but Mn3+ acts as an oxidising agent. (Atomic Numbers, Cr = 24, Mn = 25).
- The actinoids exhibit a larger number of oxidation states than the corresponding lanthanoids.
i. Write the mechanism of the following SN1 reaction:
$\left(\mathrm{CH}_3\right)_3 \mathrm{C}-\mathrm{Br} \xrightarrow{A q . \mathrm{NaOH}}\left(\mathrm{CH}_3\right)_3 \mathrm{C}-\mathrm{OH}+\mathrm{NaBr}$
ii. Write the equation for the preparation of 2-methyl-2-methoxypropane by Williamson synthesis.
→$\left(\mathrm{CH}_3\right)_3 \mathrm{C}-\mathrm{Br} \xrightarrow{A q . \mathrm{NaOH}}\left(\mathrm{CH}_3\right)_3 \mathrm{C}-\mathrm{OH}+\mathrm{NaBr}$
ii. Write the equation for the preparation of 2-methyl-2-methoxypropane by Williamson synthesis.