Generally Aldehydes behave as:

1. Oxidising agent

2. Reducing agent

3. Dehydration agent

4. Oxidizing as well as reducing agent

Compound (A) C₅H₁₀O forms a phenyl hydrazone and gives negative Tollen's and iodoform tests. Compound (A) on reduction gives n-pentane. Compound (A) is:

1. a primary alcohol

2. an aldehyde

3. a ketone

4. a secondary alcohol 

RCOOH $\to$RCH₂OH. This mode of reduction of an acid to alcohol can be affected only by:

1. Zn/HCl

2. Na-alcohol

3. aluminium isopropoxide and isopropyl alcohol

4. LiAlH₄

Ethyl ester $\underset{\mathrm{Excess}}{\overset{{\mathrm{CH}}_3\mathrm{MgBr}}{\to }}$ P. the product P will be: 

1. 

2. 

3.

4. 

Which of the following has most acidic proton?

1. CH₃COCH₃                             

2. (CH₃)₂C=CH₂

3. CH₃COCH₂COCH₃                   

4. (CH₃.CO)₃CH

Which one of the following can be oxidised to the corresponding carbonyl compound?   [2004]

1. 2-hydroxy propane

2. Ortho-nitro phenol

3. propane

4. 2-methyl-2-hydroxy propane

Dry distillation of barium salt of Hexane-1,6-dicarboxylic acid gives:

1. 

2. 

3. 

4. 

Polarisation of electrons in acrolein may be written as             

1. $\stackrel{\mathrm{\delta }+}{\mathrm{C}}{\mathrm{H}}_2=\mathrm{CH}-\mathrm{CH}=\stackrel{\mathrm{\delta }-}{\mathrm{O}}$

2. $\stackrel{\mathrm{\delta }+}{\mathrm{C}}{\mathrm{H}}_2=\stackrel{\mathrm{\delta }+}{\mathrm{C}}\mathrm{H}-\mathrm{CH}=\stackrel{}{\mathrm{O}}$

3. $\stackrel{\mathrm{\delta }+}{\mathrm{C}}{\mathrm{H}}_2=\stackrel{}{\mathrm{C}}\mathrm{H}-\mathrm{CH}=\stackrel{\delta +}{\mathrm{O}}$

4. $\stackrel{\mathrm{\delta }+}{\mathrm{C}}{\mathrm{H}}_2=\mathrm{CH}-\stackrel{\mathrm{\delta }+}{\mathrm{C}}\mathrm{H}=\mathrm{O}$

Consider the following reaction;

CH₃Br + Mg $\stackrel{\mathrm{Ether}}{\to }$A$\stackrel{\mathrm{HCHO}}{\to }$B$\stackrel{\mathrm{HOH}}{\to }$C

compound C is:

1. acetic acid

2. acetaldehyde

3. ethyl alcohol

4. formic acid

The conversion of CH₃OH to CH₃COOH can be brought in by:

1. K₂Cr₂O₇/H⁺                           

2. CO + Rh

3. KMnO₄                                   

4. H₃PO₄