51.

The compound most suitable for the preparation of cyanohydrin is :

• C₂H₅COOH

• C₆H₅NH₂

• C₂H₅COC₂H₅

• C₂H₅-C₂H₅

In the reaction :

C₆H₅CHO + C₆H₅NH₂ $\to$ C₆H₅N=HCC₆H₅ + H₂O, the compound C₆H₅N=HCC₆H₅ is known as :

• aldol

• Schiffs base

• Schiff's reagent

• Benedict's reagent

CH₃COCH₃ car be converted to CH₃CH₂CH₃ by the action of :

• HIO₃

• HNO₃

• HI

• H₃PO₃

IUPAC name of CH₃-CH(CH₂CH₃)-CH₂-CH(CN)-CH₃ is :

• 2-cyano-3-methylhexane

• 2.4-dimethylhexanenitrile

• 3-methyl-5-cyanohexane

• 2-cyano-3-methylhexane

The reaction :

C₂H₅OH $\to$ SOCl₂ $\stackrel{\mathrm{Pyridine}}{\to }$ C₂H₅Cl + SO₂ + HCl is known as :

• Kharasch effect

• Williamson's synthesis

• Darzen's procedure

• Hunsdiecker reaction

Which of the following has the highest dipole moment ?

• (H)₂-C=O

• (CH₃)₂-C=C-(H)₂

• CH₃-CH=CH-CH₃

• CH₃-C(Cl)=C(Cl)-CH₃

Assertion: Boiling and melting points of amides are higher than corresponding acids.
Reason: It is due to strong intermolecular hydrogen bonding in their molecules.

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

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

• If the assertion is true but the reason is false.

• If both the assertion and reason are false.

Assertion: DNA molecules and RNA molecules are found in the nucleus of a cell.
Reason: On heating, the enzymes do not lose their specific activity.

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

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

• If the assertion is true but the reason is false.

• If both the assertion and reason are false.

Assertion: Phenol is a weaker acid than ethanol.
Reason: Groups with +M effect and -I effect decrease acidity at m-position.

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

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

• If the assertion is true but the reason is false.

• If both the assertion and reason are false.

Assertion: Ethers behave as bases in the presence of mineral acids.

Reason: It is due to the presence of a lone pair of electrons on the oxygen.

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

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

• If the assertion is true but the reason is false.

• If both the assertion and reason are false.