Chemistry : Organic Chemistry – Some Basic Principles and Techniques

+ I effect is shown by :

• -CH₃

• -Br

• -Cl

• -NO₂

How many chiral carbonatoms are present in 2 , 3 , 4 - trichloropentane ?

• 4

• 1

• 2

• 3

Decreasing order of nucleophilicity is

• OH^- > NH${}_2^{-}$ > CH₃O^- > RNH₂

• NH_{${}_2^{-}$} > OH^- > CH₃O^- > RNH₂

• NH_{${}_2^{-}$} > CH₃O^- > OH^- > RNH₂

• CH₃O^- > NH_{${}_2^{-}$} > OH^- > RNH₂

Find the number of stereoisomers of 1,2-dihydroxy cyclopentane.

• 1

• 2

• 3

• 4

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