Chemistry : Organic Chemistry – Some Basic Principles and Techniques

Number of isomers of C₅H₆

• 2

• 3

• 4

• 5

Assertion : Phosphoric acid has no reducing properties.

Reason : Phosphoric acid does not contain P-H bonds.

• 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 : 1, 2-dichloroethane is optically active.

Reason : Meso compound is optically active.

• 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.

The strained tetracyclic alkane is isomerize thermally to the cyclic alkene. The reaction involves

• free radical

• carbocation

• carbanion

• carbene.

How much amount of CuSO₄.5H₂O is required for liberation of 2.54 g of I₂ when titrated with KI?

• 2.5 gm

• 4.99 gm

• 2.4 gm

• 1.2 gm

Which of the following conditions is not correct for resonating structures?

• The contributing structures must have the same number of unpaired electrons.

• The contributing structures should have similar energies.

• The contributing structures should be so written that unlike charges reside on atoms that are far apart.

• The positive charge should be present on the electropositive element and the negative charge on the electronegative element.

+ 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