Organic Chemistry Answers

Acetylene, C₂H₂, is a gas commonly used in welding. It is formed in the reaction of calcium carbide, CaC₂, with water. Given the thermochemical equations below, calculate the value of ΔH°_f for acetylene in units of kilojoules per mole:

(a) CaO(s) + H₂O(ℓ) ---> Ca(OH)₂(s) ΔH° = −65.3 kJ

(b) 2CaO(s) + 5C(s, gr) ---> 2CaC₂(s) + CO₂(g) ΔH° = +753 kJ

(c) CaCO₃(s) ---> CaO(s) + CO₂(g) ΔH° = +178 kJ

(d) CaC₂(s) + 2H₂O(ℓ) ---> Ca(OH)₂(s) + C₂H₂(g) ΔH° = −126 kJ

(e) C(s, gr) + O₂(g) ---> CO₂(g) ΔH° = −393.5 kJ

(f) 2H₂O(ℓ) ---> 2H₂(g) + O₂(g) ΔH° = +572 kJ

Here is the target equation:

2C(s, gr) + H₂(g) ---> C₂H₂(g)

What reagents would you use to prepare each for the following from 3-hexene?

a. 3,4-dibromohexane

b. hexane

c. 4-chlorohexane

d. 4-hexanol

write structural formula of p-nitroaniline

Draw the structure of N-methyl-N-cyclopropyl-2-chlorobutanamide

Comparing the structures of an ESTER and a CARBOXYLIC ACID, explain using words only why carboxylic acids have a higher B.P and M.P than an ester of comparable molecular weight (same # of carbons). 

Draw the structure of 2-methylbutoxypentane

What would be the name of the product that would result from the reaction of propan-1-ol with excess potassium dichromate?

A hypothetical acid HA has a dissociation constant 1.8 𝑥 10ିଷ.

a. Write a balanced dissociation reaction of the acid

b. Write the equilibrium constant expression for the acid

c. If the initial concentration of the acid is 0.5 M, determine its hydrogen ion

concentration.

d. Calculate the ionization constant

e. Comment on the strength of the acid.

22.Mercury poisoning in India is a major environment and public health concern. Mercury is most commonly used in:

Paints

Compact fluorescent lamps

Antiseptic agents

Electrical switches

Select the correct option from codes given below:

[A] 1, 2 & 3 Only

[B] 1 & 2 Only

[C] 2, 3 & 4 Only

[D] 1, 2, 3 & 4

21.Which of the following occurs as dry deposits and is also known as Sajimati (efflorescent soil) in India?

[A] Sodium carbonate

[B] Potassium carbonate

[C] Calcium carbonate

[D] Magnesium carbonate