51.

Maximum decarboxylation occurs in

• CH₃COOH

• C₆H₅COOH

• C₆H₅CH₂COOH

• CH₃COCH₂COOH

The correct increasing order of reactivity for the following molecules towards electrophilic aromatic substitution is

• I < IV < II < III

• I < IV < II < IV

• I < III < II < IV

• I < III < IV < II

The corrcet decreasing order of pK_b is 

• I > II > III > IV

• III > IV > II > I

• II > III > IV > I

• IV > II > I > III

The correct decreasing order of pK_a is

• II > IV > I > III

• IV > II > III > I

• III > II > IV > I

• IV > I > II > III

S_N2 reaction readily occurs in

• CH₃CH₂-O-CH₃

• CH₃-C(CH₃)₂-O-CH₃

• CH₂=CH-CH₂-O-CH₃

• Ph-CH₂-O-CH₂-CH₃

Assertion: Dehydration of alcohols always takes place in basic medium.

Reason : OH- is a better leaving group.

• 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 : Toluene in presence of UV rays forms benzaldehyde.

Reason : Dichlorotoluene is formed as an intermediate.

• 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 : $\mathrm{\beta }$-pleated sheet structure of protein shows maximum extension.

Reason : Intermolecular hydrogen bonding is present in them.

• 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 : Fructose is a reducing sugar.

Reason : It has a ketonic group.

• 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 : p-Nitrophenol gives more electrophilic substituted compound than m-methoxyphenol.

Reason : Methoxy group shows only negative I-effect.

• 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.