The reagent used for the separation of acetaldehyde from acetophenone is

• NaHSO₃

• C₆H₅NHNH₂

• NH₂OH

• NaOH-I₂

Among the following, the one which reacts most readily with ethanol is

• p-nitrobenzyl bromide

• p-chlorobenzyl bromide

• p-methoxybenzyl bromide

• p-methylbenzyl bromide.

593.

The nucleic acid base having two possible binding sites is

• thymine

• cytosine

• guanine

• adenine.

o-Toluic acid on reaction with Br₂+ Fe gives

The most suitable reagent for the conversion of

${\mathrm{RCH}}_2\mathrm{OH} \to \mathrm{RCHO} \mathrm{is}$

• KMnO₄

• K₂Cr₂O₇

• CrO₃

• PCC (pyridine chloro chromate).

Assertion : Sucrose is a non-reducing sugar.

Reason : It has glycosidic linkage.

• 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 : lsobutanal does not give iodofonn test.

Reason : It does not have $\mathrm{\alpha }$-hydrogen.

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

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

• If assertion is true but reason is false

• If both assertion and reason are false.

In the following reaction order, B is

${\mathrm{CH}}_3{\mathrm{CH}}_2-\mathrm{COOH} \stackrel{\mathrm{P}/{\mathrm{Br}}_2}{\to } \mathrm{A} \underset{{\mathrm{H}}^{+}}{\overset{\mathrm{alc}.\mathrm{KOH}}{\to }} \mathrm{B}$

• CH₂ =CH -COOH

• CH₂-CH(Br)-COOH

• CH₃CH₂COBr

• CH₃CH₂OH

The product of the given reaction is-

Assertion : CH₃OCH₃ and C₂H₅OH has comparable molecular weight but boiling point of C₂H₅OH is more than dimethyl ether.

Reason : C₂H₅OH forms intermolecular Hbonding while CH₃OCH₃ forms intramolecular H-bonding.

• 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 Assertion is false but Reason is true.