JEE Questions for Chemistry Organic Chemistry Some Basic Principles And Techniques Quiz 2 - MCQExams.com

X-crown Y, 18-crown-6 first number X is the total number of C and O-atom in the ring and second number Y is the number of oxygen atom in ring.

Epoxide consists of three membered ring with two carbon and one oxygen.

Glycerol contain three hydroxyl group CH₂OH–CHOH– CH₂OH. It is present in nature in oils and fats as its carboxylic esters

In CH₃COOH, the alkyl group due to its greater +I effect increases the electron density of oxygen atom of the O-H bond. Due to this, release of H⁺ ion in acetic acid will be more difficult as compared to formic acid 

Inductive effect involves displacement of σ –electron.

As chlorine  is electron withdrawing group. When Cl is attached with carboxylic acid it withdraws electrons and decreases the electron density of the oxygen atom. –Cl increases the acidity acetic acid when attached at proportional position.

There is a complete transfer of π–electrons to adjacent atom in mesomeric effect. So, mesomeric effect involoves delocalisation of pi (π) electrons

Dichloroacetic acid is more acidic than acetic due to the presence of two electron withdrawing groups.

Here the two positive charges which are at adjacent places elevates the energy thus it lowers the stability most

In toulene, methyl group is electron. Electron donating group so it increases electron density at ortho and para position while in sulphonation, –SO₃ act as an electrophile. So, (–SO₃H) attacks on ortho and para position readily.         

Carbocation shows diamagnetic behaviour due to the presence of even number of valence electrons

Phenol reacts with chloroform and NaOH to give O–hydroxy  benzaldehyde or salicylaldehyde. In this reaction dichlorocarbene (: CCl₂) electrophile is generated. This is known as Reimer – Tiemann reaction.

Disymmetric object never superimposed on its mirror image.

Stability order of conformation of cyclohexane is Chair > twist boat > boat > half chair. Due to torsional and angle strain half chair is less stable.

2 butene exhibit rotamers. Rotamers are the isomers formed by restricted rotation.

An equimolar mixture of the enantiomers is called racemic mixture

Succinic acid does not contain any chiral carbon atom. The acrbon atom for which four valencies are satisfed by four different group, it is termed as chiral carbon atom.

There are 8 isomers n–pentanol, 2 – pentanol, 3–pentanol, 2–methyl butanol, 2–methyl butan–2–ol, 3–methyl butanol, 2,2–dimethyl propanol and 3–methyl butan–2–ol

The structures of fumaric and maleic acid suggest that theya are geometrical iosmers because they have same molecular formula but different spatial arrangement of atoms around a double bond.

There are 12 isomers in all

a) Six geometrical isomers

b) Two optical isomers

c) Four structural isomers

1-choloropentane is not chiral. To optically active, compound or structure should be posses a chiral carbon atom