Chemistry : Organic Chemistry – Some Basic Principles and Techniques

The IUPAC name of the following compound is-

• ethoxy propane

• 1,1-dimethyl ether

• 2-ethoxy isopropane

• 2-ethoxy propane

Calorific value of producer gas is low because of

• high percent of N₂

• low percent of CO₂

• high percent of CO

• low percent of N₂

One mole of alkene $\underline{\mathrm{X}}$ on ozonolysis gave one mole of acetaldehyde and one mole of acetone. The IUPAC name of $\underline{\mathrm{X}}$ is

• 2-methyl-2-butene

• 2-methyl-1-butene

• 2-butene

• 1-butene

The concentration of an organic compound in chloroform is 6.15 g per 100 mL of solution. A portion of this solution in a 5 cm polarimeter tube causes an observed rotation of -1.2°. What is the specific rotation of the compound?

• + 12°

• -3.9°

• -39°

• +61.5°

Which one of the following exhibits enantiomerism?

• BeCH₂-CH₂-CH₂-CH₂Br

• H₃C-CH(Br)-CH₂-CH₂-CH₃

• H₃C-CH₂-CH₂-CH₂Br

• H₃C-CH₂-CBr₂-CH₃

With respect to chlorobenzene, which of the following statements is not correct ?

• Cl is ortho/para directing

• Cl exhibits + M effect

• Cl is ring deactivating

• Cl is meta directing

Match the following.

	Column I		Column II
A.	Acetaldehyde,vinyl alcohol	1.	Enantiomers
B.	Eclipsed and staggered ethane	2.	Tautomers
C.	(+)2-butanol,(-)2-butanol	3.	Chain isomers
D.	Methyl-n-propyl-amine and diethylamine	4.	Conformational isomers
		5.	Metamers

• A B C D

  1 4 3 5

• A B C D

  2 4 1 5

• A B C D 

  5 1 4 2

• A B C D

  5 1 3 2

Different conformations of the same molecule are called

• isomers

• epimers

• enantiomers

• rotamers

Assertion (A) : NH₂ group of aniline is ortho, para directing in electrophilic substitutions.

Reason (R) : -NH₂ group stabilises the arenium ion formed by the ortho, para attack of the electrophile.

The correct answer is

• Both (A) and (R) are correct, (R) is the correct explanation of (A).

• Both (A) and (R) are correct, (R) is not the correct explanation of (A).

• (A) is correct, but (R) is not correct.

• (A) is not correct, but (R) is correct.

In which of the following properties, the two enantiomers of lactic acid differ from each other?

• Sign of specific rotation

• Density

• Melting point

• Refractive index