The -OH group of an alcohol or the -COOH group of a carboxylic acid can be replaced by -Cl using     

(1) phosphorus pentachloride

(2) hypochlorous acid

(3) chlorine

(4) hydrochloric acid

A and B in the following reactions are-  

1. A=RR'CH₂CN,              B=NaOH

2. A=RR'C${<}_{\mathrm{COOH}}^{\mathrm{OH}}$ ,          B=CH₃

3. A=RR'C${<}_{\mathrm{COOH}}^{\mathrm{CN}}$ ,          B=CH₃

4. A=RR"C${<}_{\mathrm{OH}}^{\mathrm{CN}}$,              B=LiAlH₄

Benzaldehyde and acetaldehyde can be distinguished by:

1. Iodoform test

2. 2:4 DNP test

3. ${\mathrm{NH}}_3$ reaction

4. Wolff-Kishner's reduction

Acetaldehyde reacts with                

1. only electrophiles

2. only nucleophiles

3. only free radicals

4. both electrophiles and nucleophiles

Nucleophilic addition reaction will be most favoured in                   [2006]

(1) $$
$\mathrm{O}$
$\parallel$
${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2\mathrm{C}-{\mathrm{CH}}_3$

(2) $({\mathrm{CH}}_3{)}_2\mathrm{C}=\mathrm{O}$

(3) ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{CHO}$

(4) ${\mathrm{CH}}_3\mathrm{CHO}$

What is present in acetone's enolic form?

1. 9 $\mathrm{\sigma }$-bonds, 1$\mathrm{\pi }$-bond and 2 lone pairs

2. 8 $\mathrm{\sigma }$-bonds, 2$\mathrm{\pi }$-bonds and 2 lone pairs

3. 10 $\mathrm{\sigma }$-bonds, 1$\mathrm{\pi }$-bond and 1 lone pair

4. 9 $\mathrm{\sigma }$-bonds, 2$\mathrm{\pi }$-bonds and 1 lone pair

In this reaction,

CH₃CHO + HCN $\to$CH₃CH(OH)CN $\stackrel{\mathrm{H}.\mathrm{OH}}{\to }$CH₃CH(OH)COOH

an asymmetric compound is generated. The acid obtained would be            

1. 50% D + 50% L-isomer

2. 20% D + 80% L-isomer

3. D-isomer

4. L-isomer

Which compound, upon hydrolysis of its cyanohydrin, yields lactic acid?

1. Acetone                                 

2. Acetaldehyde

3. Propanal                                 

4. HCHO

Formaldehyde can be distinguished from acetaldehyde by:

(a) Fehling's solution                     

(b) Schiff's reagent

(c) Ammonia                               

(d) Ammoniacal ${\mathrm{AgNO}}_3$

Consider the following reaction,

The reaction is fastest when X is-

1. Cl

2. NH₂

3. OC₂H₅

4. OCOR