Which one of the following is an example for negative mesomeric effect ?

(a)

-SH

(b)

-SR

(c)

-NH₂

(d)

-NO₂

Which one of the following electrophile used for nitration of benzene ?

(a)

Br^⊕

(b)

NO₂^⊕

(c)

-NH₂

(d)

NO^Ө

Identify the one which does not come under the organic addition reaction.

(a)

Hydration

(b)

Dehydration

(c)

Halogenation

(d)

Hydro halogenation

Primary alcohols undergo which type of reaction to form alkenes ?

(a)

Elimination

(b)

Oxidation

(c)

Reduction

(d)

Hydrolysis

CH₃CHO \(\overset { (o) }{ \longrightarrow } \) CH₃COOH. Identify the type of reaction ?

(a)

Addition reaction

(b)

Elimination reaction

(c)

Reduction reaction

(d)

Oxidation reaction