Acetaldehyde normally reacts with                

1. only electrophiles

2. only nucleophiles

3. only free radicals

4. both electrophiles and nucleophiles

Muscone (an explosive perfume secreted by musk deer) has the structure

 . Its IUPAC name is:

1. 3-methyl cyclopentadecanone

2. methyl cyclopentadecan-3-one

3. 3-methyl cyclotetradecanone

4. 3-methyl cyclohexadecan-3-one

Which of the following has most acidic hydrogen?

1. 3-hexanone                         

2. 2,4-hexanedione

3. 2,5-hexanedione                   

4. 2,3-hexanedione

Which can be reduced to corresponding hydrocarbon by Zn-Hg/conc HCl?

1. Butan-2-one

2. Acetic acid

3. Acetamide

4. Ethyl acetate

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. ${\mathrm{CH}}_3\mathrm{CHO}$

The enolic form of acetone contains:

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

Ethane can be obtained from ethanal in one step by:

1. Na-Hg + water

2. Zn-Hg + conc.HCl

3. aluminium isopropoxide and isopropyl alcohol

4. LiAlH₄ + ether

Which one of the following compounds on treatment with LiAlH₄ will give a product that will give a positive iodoform test?

1. CH₃CH₂CHO                             

2. CH₃CH₂COOCH₃

3. CH₃CH₂OCH₂CH₃                      

4. CH₃COCH₃

Aldehydes and ketones will not form crystalline derivatives with                   

1. sodium bisulphite

2. phenyl hydrazine

3. semicarbazide hydrochloride

4. dihydrogen sodium phosphate