- Isopropyl iodide is formed after reaction of propene with HI, this is due to (PPSC 2015)?
a) more stable free radical
b) homolysis
c) more stable carbanion
d) more stable carbocation - Which one of the following compound forms salt on reaction with NaNH2??
a) C2H2
b) C2H6
c) C6H6
d) C2H4 - Which among the following reagent can be used to distinguish between CH2CHC≡CH from CH3CH≡CCH3??
a) Br2/CCl4
b) cold KMnO4
c) Ammonical AgNO3
d) Ag(NH3)2OH - The product obtained on heating 2-Bromopentane with potassium ethoxide in ethanol is (PPSC 2020)?
a) 1-pentene
b) 2-cis-pentene
c) trans-2-pentene
d) 2-ethoxy pentane - Which among the following product is formed when ethyne undergoes oxidation??
a) Formaldehyde
b) Bromobenzene
c) Chlorobenzene
d) Chloroethene
b) Formic acid
c) Acetaldehyde
d) Acetic acid
- Choose the process by which liquid hydrocarbons can be converted to gaseous hydrocarbons?
a) hydrolysis
b) oxidation
c) cracking
d) distillation under reduced pressure - The simplest member of organic compounds is??
a) Methanol
b) Methane
c) Formaldehyde
d) Formic acid - Ethane is obtained by electrolyzing __?
a) Potassium formate
b) Potassium succinate
c) Potassium acetate
d) Potassium fumarate - Cooking gas is a Mixture of following two gases (PPSC 2020)?
a) methane and ethane
b) Ethane and Propane
c)Propane and Butane
d)Butane and Pentane - which of the following product is used for the construction of roads?
a) Bitumen
b) coke
c) parafin
d) all of these - Petroleum is a mixture of?
a) salts
b) elements
c) polymers
d) Hydrocarbons - Most of the explosions in the mines in due to?
a)methane and air
b) oxygen with acetylene
c) hydrogen with oxygen
d) none of these - Which of following fuel has highest calorific value (PPSC 2015)?
a) Methane
b) Kerosene
c) Hydrogen
d) LPG - Bromine water reacts with?
a) Alkenes
b) Alkanes
c) Alkynes
d) both and c - Which statement is not true?
a) Alkanes undergo only substitution reactions
b) Alkenes and alkynes undergo both substitution and addition reactions
c) Alkanes undergo both substitution and addition reactions
d) none of these - Select the incorrect statement regarding terminal alkynes.?
a) Methylacetylene is an example of terminal alkynes
b) Terminal alkynes are more acidic when compared with alkenes
c) Terminal alkynes are not as acidic as alkanes
d) These have a replaceable acidic hydrogen atom
17- Which of the following statements is wrong??
a) When two orbitals overlap in-phase with each other, a bonding molecular orbital forms.
b) When two orbitals overlap out-of-phase with each other, an antibonding molecular orbital forms.
c) When one of two atoms connected by a σ bond rotates about the bond axis, orbital overlap is lost.
d) When one of two atoms connected by a π bond rotates about the bond axis, orbital overlap is lost.
18- Incorrect statement is?
a) Hydroboration-oxidation of a terminal alkyne gives a ketone as the main product
b) Hydrogenation of an internal alkyne over the Lindlar catalyst gives a cis alkene
c) In the epoxidation of an alkene with a peroxy acid, the peroxy acid is electrophilic
d) All are correct
19- Which of the following reaction is not shown by ketones? (PPSC 2020)?
a) Reaction with HCN
b) Reaction with NaHSO3
c) Reaction with 2 4 dinitrophenyl hydrazine
d) Reaction with Fehling solution
20- Find the incorrect statement for a nucleophile?
a) A nucleophile is a Lewis acid
b) Nucleophiles do not seek electron
c) Ammonia is a nucleophile
d) Nucleophiles attack low electron density sites
21- Which among the following is the most deactivating meta-directing group in aromatic substitution reaction? (PPSC 2020)?
a) -COOH
b) -SO3H
c) -NO2
d) -CN
22- Which of the following statements is wrong about alkene??
a) The main orbital interactions in the transition state of an electrophilic addition to an alkene are between the LUMO of the electrophile and the HOMO of the alkene.
b) The lower the LUMO of the electrophile, the more reactive it is.
c) The lower the HOMO of the alkene, the more reactive it is.
d) none of these
