This conversion can be achieved by :

(1) Dehydration, Hydrolysis

(2) Retro aldol and further condensation 

(3) Perkin condensation & Clemmensen reduction

(4) Clemmensen and Perkin condensation 

\(\left(CH\right)_{3} - \overset{\overset{O}{\parallel}}{C} - \left(CH\right)_{2} - \left(CH\right)_{2} - \left(CH\right)_{2} - \left(CH\right)_{2} - \overset{\overset{O}{\parallel}}{C} - H \overset{\left(HO\right)^{-} / \Delta}{\rightarrow} (\underset{73 \%}{A})\)
Product (A) is:

$\mathrm{Ph}-\mathrm{CH}=\mathrm{CHCHO} + {\mathrm{CH}}_3\mathrm{CH}=\mathrm{CHCHO}\underset{\mathrm{ErOH}, ∆}{\overset{\mathrm{base}}{\to }}$ (A) 87%; product of this reaction is :

1. $\mathrm{Ph}-{\left(\mathrm{CH}=\mathrm{CH}\right)}_2-\mathrm{CHO}$

2. $\mathrm{Ph}-{\left(\mathrm{CH}=\mathrm{CH}\right)}_3\mathrm{CHO}$

3. $\mathrm{Ph}-{\left(\mathrm{CH}=\mathrm{CH}\right)}_4\mathrm{CHO}$

4. $\mathrm{Ph}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}-{\mathrm{CH}}_3$

CH₃CHO$\underset{5°\mathrm{C}}{\overset{10\%\mathrm{NaOH}}{\to }}\underset{∆}{\to }\underset{\mathrm{Ni}}{\overset{{\mathrm{H}}_2}{\to }}$$$(A) ; Product (A) of the reaction is :

(1) Propanol

(2) ethanol

(3) butanol

(4) pentanol

$A \underset{2. ∆}{\overset{1. dil NaOH}{\to }}$

Reactant (A) is?

1.${\mathrm{CH}}_3-\stackrel{\stackrel{\mathrm{O}}{\parallel }}{\mathrm{C}}-{\left({\mathrm{CH}}_2\right)}_5-\stackrel{\stackrel{\mathrm{O}}{\parallel }}{\mathrm{C}}-{\mathrm{CH}}_3$

2.${\mathrm{CH}}_3-\stackrel{\stackrel{\mathrm{O}}{\parallel }}{\mathrm{C}}-{\left({\mathrm{CH}}_2\right)}_4-\stackrel{\stackrel{\mathrm{O}}{\parallel }}{\mathrm{C}}-{\mathrm{CH}}_3$

3.$\mathrm{H}-\stackrel{\stackrel{\mathrm{O}}{\parallel }}{\mathrm{C}}-{\left({\mathrm{CH}}_2\right)}_5-\stackrel{\stackrel{\mathrm{O}}{\parallel }}{\mathrm{C}}-\mathrm{H}$

4.${\mathrm{CH}}_3-\stackrel{\stackrel{\mathrm{O}}{\parallel }}{\mathrm{C}}-{\left({\mathrm{CH}}_2\right)}_4-{\mathrm{CH}}_2-\mathrm{OH}$

The reaction,

Compare enolate A with enolate B.

Which of the following statements is true?

1. A is more stable than B                               
2. A and B have the same stability
3. B is more stable than A                               
4. No comparison of stability can be made

$\stackrel{\mathrm{PCC}}{\to }\left(\mathrm{A}\right) \underset{∆}{\overset{\mathrm{dil}. \mathrm{NaOH}}{\to }}\left(\mathrm{B}\right)$

Product (B) is:

1.    
2.      
3.    
4.  

Identify the principal product of the following reaction?

$\underset{\mathrm{ethanol}, \mathrm{water}, \mathrm{heat}}{\overset{\mathrm{NaOH}}{\to }}{\mathrm{H}}_2\mathrm{O} +?$
1.                               
2.

3.      
4.

The enolate ion that reacts with 3-buten-2-one to form (Y) is :

(a)          (b)          (c)           (d)