Polarity
How do you find polarity?
EN(A)- EN(B)= Difference in EN (Polartity)
What are the intermolecular forces?
LDF, Di-Di, Hydrogen bonds
Hydrocarbons are named ending with ----
(A)-ane for unsaturated hydrocarbons with a double bond
(B)-ene for unsaturated hydrocarbons with a double bond
(C)-yne for unsaturated hydrocarbons with a triple bond
(D)-ane for saturated hydrocarbons with all single bonds
(E) All (B), (C), and (D) are right
E) All (B), (C), and (D) are right
The gas law that is routinely used during our lungs’ function is ----- and it is represented as -----
(A)Charles’ law, V1/T1 = V2/T2 (B) Gay-Lussac’s law, P1V1 = P2V2 (C) Boyle’s law, P1V1 =P2V2 (D) Gay-Lussac’s law, P1/T1 = P2/T2
C)Boyle’s law, P1V1 =P2V2
Molecular or covalent compounds are made from reactions with
In Pauling scale, the electronegativity of Fluorine has taken as a standard. What is that value?
4.0
The order of the strength of the intermolecular forces is
(A)H-bonds>> LDF>>D-D
(B) H-bonds>>D-D>>LDF
(C) D-D>>LDF>>H-bonds
(D) LDF>>D-D>>H-bonds
b)H-bonds>>D-D>>LDF
The general formula of an Alkyl group is ____. When n is 4, the name of the alkyl group is____.
CnH2n+1, Butyl
Hyperbaric Oxygen therapy is routinely used to treat patients suffering from ------. It forces Oxygen to diffuse inside the patents’ body due to ---------.
(A)CO poisoning, decrease Oxygen pressure outside
(B) CO poisoning, increase Oxygen pressure outside
(C) CO2 poisoning, increased CO2 pressure outside
(D) Oxygen, CO poisoning
B)CO poisoning, increase Oxygen pressure outside
Lower molecular weight alcohols, aldehydes, ketones, and carboxylic acids are mostly liquids due to
(A)Names of the molecules ending with -ol, -al, -one, and -oic respectively
(B) Dipole-dipole interactions
(C) Hydrophilic interactions are stronger
(D) LDF and H-bonds
C) Hydrophilic interactions are stronger
If the electronegativity (electron affinity) difference between bonded atoms is -------, then it’s polar, ----- then it’s non-polar, and ---- then the molecule is ionic.
(A)<0.5, >0.5-1.9, and >1.9 (B) 1.9, <0.5, >0.5-1 (C) 0.5, <0.5-1.9, <0.5. (D) 0.5-1.9, <0.5, and >1.9.
(D) 0.5-1.9, <0.5, and >1.9
Q20. The origin of London’s Dispersion Force is
(A)Dipole-dipole interaction (B) Induced dipole – induced dipole interaction (C) H-bonds (D) Ionic
B)Induced dipole – induced dipole interaction
The 3D structures of the C1 and C2 in Acetaldehyde (CH3COCH3) are -------- and ------.
(A)Tetrahedral and Linear (B) Triangular planner and Tetrahedral (C) Tetrahedral and Tetrahedral (D) Tetrahedral and Triangular planner
(D) Tetrahedral and Triangular planner
When Alcohols are heated in the presence of a catalyst, they generate ---- and their general formula is----- (3)
(A)Ethers, RCOR1
(B) Ethers, ROR1
(C) Esters, ROR1
(D) Esters, RCOOR1
(D) Esters, RCOOR1
Carboxylic acids are polar molecules and therefore they are soluble in water. But when the hydrocarbon chain (i.e. the number of carbon atoms) goes twelve and above, they become insoluble.This is because
(A) Hydrophilic interaction at the polar end is greater than the hydrophobic interaction at the non-polar
end of the molecule.
(B) Both hydrophobic and hydrophilic interactions in these types of molecules are equal.
(C) Hydrophobic interaction in the non-polar end is greater than the hydrophilic interaction at the polar end of the molecule.
(D)None of the above.
C)Hydrophobic interaction in the non-polar end is greater than the hydrophilic interaction at the polar end of the molecule.
Is CH3-OH polar or nonpolar?
Show how you found it
Polar
The Boiling Point of n-Butane is 0.5◦C, whereas BP of Acetone is 58◦C. Why?
(A)These molecules have different Molecular Weights
(B)The n-Butane has LDF, whereas Acetone has dipole-dipole interactions
(C) n-Butane and Acetone have similar structures
(D)Both molecules are polar
B)The n-Butane has LDF, whereas Acetone has dipole-dipole interactions
In compounds with Carbon-Carbon double bonds, there is one ---bond and one --- bond, whereas in
Carbon-Carbon triple bonds, there (is) are --- bond(s) and ---- bond(s).
(A)Pie and sigma; two pie and two sigma
(B) Two Pie and one sigma; two pie and two sigma
(C) Pie and sigma; two pie and three sigma
(D) Pie and sigma; two pie and one sigma
D) Pie and sigma; two pie and one sigma
Dehydration reactions with alcohols make _____, whereas similar reactions with carboxylic acids make ______
Esters, acid anhydrides
Aldehydes, ketones, and carboxylic acids have a common functional group, which is known as -----and it is represented as -------.
(A) Alkyl group, R-
(B) Carboxyl group, -COOH
(C) Carbonyl group, >C=O
(D) –ol group, -OH
(C) Carbonyl group, >C=O
Identify whether the following molecules are polar or non-polar:
[EN of C =2.5, H =2.1, O =3.5, N = 3.0, and Cl = 3.0]
(i) CH4 (ii) CO2 (iii) CHCl3 (iv) CCl4 (v) RN(R1)R2
(A)All molecules are polar (B) Molecules (i), (iii), and (v) are polar (C) Molecules (ii) and (iv) are
polar (D) Molecules (iii) and (v) are polar
(D) Molecules (iii) and (v) are polar
Explain why water is liquid but hydrogen sulfide is a gas? [EN of O = 3.5, EN of S = 2.5, and EN of H =2.1]
(A)Water is polar and hydrogen sulfide is non-polar
(B)Water molecules makes a network type of H-bonds and H2S has LDF
(C) There is a least amount of molecular space in water whereas, H2S molecules are widely dispersed
(D)All of these
D) All of these
In general, the names of Alkanes end with ----, names of Alcohols end with ----, names of Aldehydes end with -----, names of Ketones end with ------, and names of Carboxylic acids end with ----.
(A)Ane, ol, al, one, and amines
(B) Ane, ol, al, one, oic
(C) Ene, ol, al, one, and oic
(D) Yne, ol,al, oic, and one
B) Ane, ol, al, one, oic
During esterification (making Esters) reaction, the ------- from the carboxylic acid takes the ------ from the alcohol to make ------ and ------.
(A)-OH group, Proton, Water and Ester
(B) Proton, -OH group, hydrogen, and Ester
(C) Proton, -OH group, Ester, and Water
(D) -OH group, Proton, Ester, and Water
C)Proton, -OH group, Ester, and Water
Alcohols are routinely used for ------; Ethers were used to use during -----; Aldehyde/Ketones are routinely used for -----; and Amines are used for -------.
(A)Polymers, Disinfectant, Analgesics, and Surgery
(B)Preservatives, Cleaning the surgical areas, Surgery, and Pharmaceutical drugs
(C) Pharmaceutical drugs, Analgesics, Surgery, and Disinfectant
(D)Disinfectant, Surgery, Pharmaceutical drugs, and Analgesics
(D)Disinfectant, Surgery, Pharmaceutical drugs, and Analgesics