Question

What would be the reactant and reagent used to obtain 2, 4-dimethylpentan-3-ol?

A. Propanal and propyl magnesium bromide
B. 3-Methylbutanal and 2-methyl magnesium iodide
C. 2, 2-Dimethylpropanone and methyl magnesium iodide
D. 2-Methylpropanal and isopropyl magnesium iodide  
Answer :   2-Methylpropanal and isopropyl magnesium iodide
Solution :
\[\underset{\text{2-Methylpropanal}}{\mathop{C{{H}_{3}}\underset{\begin{smallmatrix} |\,\,\,\,\, \\ C{{H}_{3}}\, \end{smallmatrix}}{\mathop{-CH-}}\,\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{C}}\,=}}\,\]    \[\underset{\text{Isopropyl magnesium iodide}}{\mathop{O+{{\left( C{{H}_{3}} \right)}_{2}}CHMgI\to }}\,\]    \[{{\left( C{{H}_{3}} \right)}_{2}}\,\underset{\begin{smallmatrix} |\,\,\,\,\,\, \\ \,\,\,\,\,\,\,\,\,CH{{\left( C{{H}_{3}} \right)}_{2}} \end{smallmatrix}}{\overset{\begin{smallmatrix} H\,\,\,\, \\ |\,\,\,\,\, \end{smallmatrix}}{\mathop{CH-C-OMgI}}}\,\]     \[\xrightarrow{{{H}_{2}}O}\underset{\text{2, 4-Dimethylpentan-3-o1}}{\mathop{{{\left( C{{H}_{3}} \right)}_{2}}\,\underset{\begin{smallmatrix} | \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,CH{{\left( C{{H}_{3}} \right)}_{2}} \end{smallmatrix}}{\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{CH-C-OH}}}\,}}\,\]

Releted MCQ Question on
Organic Chemistry >> Alcohol, Phenol and Ether

Releted Question 1

Ethyl alcohol is heated with conc $${H_2}S{O_4}$$  the product formed is

A. \[{{H}_{3}}C\underset{\begin{smallmatrix} \parallel \\ O \end{smallmatrix}}{\mathop{-C-}}\,O{{C}_{2}}{{H}_{5}}\]
B. $${C_2}{H_6}$$
C. $${C_2}{H_4}$$
D. $${C_2}{H_2}$$
Releted Question 2

The compound which reacts fastest with Lucas reagent at room temperature is

A. $${\text{butan - 1 - ol}}$$
B. $${\text{butan - 2 - ol}}$$
C. $${\text{2 - methylpropan - 1 - ol}}$$
D. $${\text{2 - methylpropan - 2 - ol}}$$
Releted Question 3

A compound that gives a positive iodoform test is

A. 1 - pentanol
B. 2 - pentanone
C. 3 - pentanone
D. pentanal
Releted Question 4

Diethyl ether on heating with conc. $$HI$$  gives two moles of $$H$$

A. ethanol
B. iodoform
C. ethyl iodide
D. methyl iodide

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Alcohol, Phenol and Ether


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