Which of the following enzymes can hydrolyse urea into CO₂ and NH_{3 :}

1. Amylase

2. Urease

3. Lipase

4. Zymase

What is product 'B' in the below mentioned reaction?

1.		2.
3.		4.

HCN not produce a chiral compound with:

1.		2.
3.		4.

An alkene “A” on reaction with O₃ and Zn - H₂O gives propanone and ethanal in an equimolar ratio. The addition of HCl to alkene “A” gives “B” as the major product. The structure of product “B” is:

1.		2.
3.		4.

Carbonyl compounds undergo nucleophilic addition because of 

1. The electrophilic carbonyl carbon forms a sigma bond with the nucleophile.

2. Electromeric effect.

3. Electronegativity difference of carbon and oxygen atoms.

4. None of the above

Carboxylic acids are more acidic than phenol and alcohol because of 

1. formations of dimers

2. highly acidic hydrogen

3. resonance stabilization of their conjugate base

4. intermolecular hydrogen bonding 

Acetaldehyde cannot exhibit

1. Iodoform test

2. Benedict's test

3. Lucas test

4. Tollen's test

Ketones$\left({\mathrm{R}}_1{\mathrm{COR}}_2\right)$; ${\mathrm{R}}_1={\mathrm{R}}_2=$alkyl groups, can be obtained in one step by:

1. hydrolysis of esters

2. oxidation of primary alcohols

3. oxidation of secondary alcohols

4. reaction of acid halides and alcohols

The product formed by the reaction of chlorine with benzaldehyde in the absence of catalyst is

1. benzoyl chloride

2. benzyl chloride

3. chlorobenzene

4. o-chlorobenzaldehyde

When ethanal is heated with Fehling's solution it gives a precipitate of -

1. CuO

2. Cu

3. $\mathrm{Cu}+{\mathrm{Cu}}_2\mathrm{O}+\mathrm{CuO}$

4. ${\mathrm{Cu}}_2\mathrm{O}$