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 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

165.

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]

Which of the following will show geometrical isomerism?

• 1-butene

• 2-butene

• 2-methyl propene

• Propene

n-propyl alcohol and iso-propyl alcohol are examples of

• position isomerism

• chain isomerism

• tautomerism

• geometrical isomerism

Optical isomerism is shown by

• butanol-1

• butanol-2

• butene-1

• butene-2

The IUPAC name of the following compound is:

• 7 [β-methyl butyl]; 9 butyl tridecane

• 3 [β-ethyl butyl]; 9 ethyl tridecane

• 2 [β-ethyl ethenyl]; 8 propyl decane

• None of the above

Total number of isomers of C₄H₁₀O is

• 7

• 4

• 3

• 8