Chemistry : Organic Chemistry – Some Basic Principles and Techniques

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

In Dumas method, 0.3 g of an organic compound gave 45 mL of nitrogen at STP. The percentage of nitrogen is

• 16.9

• 18.7

• 23.2

• 29.6

The IUPAC name of the following compound is-

(CH₃)₂CH-CH=CH-CH=CH(C₂H₅)-CH₃

• 2, 7-dimethyl-3, 5-nonadiene

• 2, 7-dimethyl-2-ethylheptadene

• 2-methyl-7-ethyl-3, 5-octadiene

• 1, 1-dimethyl-6-ethyl-2, 4-heptadiene

Identify the correct statements from the following
(i) Electromeric effect is a permanent effect

(ii) Hyper conjugation is a temporary effect

(iii) Fractional distillation is used to separate two liquids from a mixture if the difference in their boiling points is less

(iv) Different compounds are adsorbed on an adsorbent different extents

• ii, iii, iv

• i, ii, iii

• ii, iv

• iii, iv

Ferric ion forms a Prussian blue coloured precipitate due to formation of

• K₄[Fe(CN)₆]

• Fe₄[Fe(CN)₆]₃

• Fe(CNS)₃

• K₃[Fe(CN)₆]