Chemical Reactions

Phenols (but not alcohols) on distillation with zinc dust give the corresponding aromatic hydrocarbons

Reimer-Tiemann reaction is an electrophilic substitution reaction and occurs through the following steps :

Hofmann's ammonolysis of alkyl halides usually gives a mixture of primary, secondary and tertiary amines along with some quaternary ammonium salts. However, primary amine is obtained as a major product by taking large excess of ammonia

Aniline is far less basic than ammonia and aliphatic amines due to delocalization of lone pair of electrons on the benzene ring. Aliphatic amines are stronger bases than ammonia due to +/ effect of alkyl group: More the number of alkyl groups stronger is the base. Hence basic strength will follow the order:

1. Moles of HCl produced in 1 day:
Gastric juice contains 3.0 g of HCl per L. So, in 2.5 L of gastric juice, the total amount of HCl is: Now, the molar mass of HCl is , so the moles of HCl are: 2. Moles of Mg(OH) required to neutralize the HCl:
The balanced equation for the neutralization reaction is: This shows that 1 mole of Mg(OH) reacts with 2 moles of HCl. Therefore, the moles of Mg(OH) required are: 3. Mass of Mg(OH) required:
The molar mass of Mg(OH) is , so the mass of Mg(OH) required is: 4. Number of tablets required:
Each tablet contains 600 mg (or 0.6 g) of Mg(OH) . Therefore, the number of tablets required is: Thus, approximately 10 tablets are required to neutralize the whole HCl produce(D)

The Arrhenius equation is given by: where: - is the rate constant, - is the pre-exponential factor, - is the activation energy, - is the universal gas constant, and - is the temperature in Kelvin. Taking the natural logarithm of both sides, we get: This equation shows a linear relationship between and . Therefore, when the graph of is plotted against , we expect a straight line with a negative slope proportional to the activation energy . From the given options, the correct graph corresponding to the Arrhenius equation is the one showing a straight-line decrease with increasing , which corresponds to Option (D)