Chemistry : Organic Chemistry – Some Basic Principles and Techniques

Best method to form aromatic iodide is

• ArN${}_2^{+}$ + KI $\to$

• RNH₂ + I₂ $\to$

• ArN${}_2^{+}$ + KI $\to$

• ArN${}_2^{+}$ + PI₃ $\to$

Which is optically inactive?

Assertion : C(CH₃)₃-CH₂-Br + NaOH $\to$C(CH₃)₂OH-CH₂-CH₃

Reason : It follows with formation of more stable carbocation.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.

Assertion : The nuclear isomers are the atoms with the same atomic number and same mass number, but with different radioactive properties.

Reason : The nucleus in the excited state will evidently have a different half-life as compared to that in the ground state

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion : 2,3-Dimethylbut-2-ene is more stable than but-2-ene.

Reason : Six hyperconjugation structures can be written for 2, 3-dimethylbut-2-ene while but-2-ene has twelve.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Which of the following compounds is expected to be optically active ?

• (CH₃)₂CHCHO

• CH₃CH₂CH₂CHO

• CH₃CH₂CHBrCHO

• CH₃CH₂CBr₂CHO

CH₃(CH₂)₄CH₃ $\underset{773 \mathrm{K}, 10-20 \mathrm{atm}}{\overset{{\mathrm{Cr}}_2{\mathrm{O}}_3/ {\mathrm{Al}}_2{\mathrm{O}}_3}{\to }} \mathrm{A} \stackrel{{\mathrm{Br}}_2/ \mathrm{Fe}}{\to } \mathrm{B} \underset{\mathrm{ether}}{\overset{\mathrm{Mg}}{\to }} \mathrm{C} \stackrel{{\mathrm{H}}_2\mathrm{O}}{\to } \mathrm{D}$

What is D?

Which is the strongest acid ?

• ClCH₂COOH

• CH₃COOH

• Cl₂CHCOOH

• CCl₃COOH

Which of the compound is optically active ?

• 1 - butanol

• Ethanol

• 2 - butanol

• Isopropyl alcohol

How many geometrical isomers are possible in the following two alkenes ?

(i) CH₃ - CH = CH - CH = CH - CH₃

(ii) CH₃ - CH = CH - CH = CH - Cl

• 4 and 4

• 4 and 3

• 3 and 3

• 3 and 4.