Question

Identify $$(X), (Y)$$   and $$(Z)$$  reagents in the given sequence of reactions.
\[CH\equiv CH\xrightarrow{X}C{{H}_{3}}CHO\]      \[\xrightarrow{Y}C{{H}_{3}}CH\left( OH \right)C{{H}_{3}}\]      \[\xrightarrow{Z}C{{H}_{3}}COC{{H}_{3}}\]

A. $$X = {H_2}S{O_4},Y = \frac{{{H_2}O}}{{O{H^ - }}},$$      $$Z = PC{l_5},{\text{heat}}$$
B. $$X = HN{O_3},Y = N{a_2}C{O_3},$$      $$Z = {H_2}S{O_4},{\text{heat}}$$
C. $$X = \frac{{{H_2}S{O_4}}}{{H{g^{2 + }}}},Y = \frac{{PC{l_5}}}{{{H_2}O}},$$      $$Z = \frac{{{K_2}C{r_2}{O_7}}}{{O{H^ - }}}$$
D. $$X = \frac{{{H_2}S{O_4}}}{{H{g^{2 + }}}},Y = \frac{{C{H_3}MgBr}}{{{H_2}O}},$$       $$Z = \frac{{{K_2}C{r_2}{O_7}}}{{{H^ + }}}$$  
Answer :   $$X = \frac{{{H_2}S{O_4}}}{{H{g^{2 + }}}},Y = \frac{{C{H_3}MgBr}}{{{H_2}O}},$$       $$Z = \frac{{{K_2}C{r_2}{O_7}}}{{{H^ + }}}$$

Releted MCQ Question on
Organic Chemistry >> Aldehyde and Ketone

Releted Question 1

The reagent with which both acetaldehyde and acetone react easily is

A. Fehling’s reagent
B. Grignard reagent
C. Schiff’s reagent
D. Tollen’s reagent
Releted Question 2

The Cannizzaro reaction is not given by

A. trimethylacetaldehye
B. acetaldehyde
C. benzaldehyde
D. formaldehyde
Releted Question 3

The compound that will not give iodoform on treatment with alkali and iodine is :

A. acetone
B. ethanol
C. diethyl ketone
D. isopropyl alcohol
Releted Question 4

Polarisation of electrons in acrolein may be written as

A. $$\mathop {C{H_2}}\limits^{{\delta ^ - }} = CH - \mathop {CH}\limits^{{\delta ^ + }} = O$$
B. $$\mathop {C{H_2}}\limits^{{\delta ^ - }} = CH - CH = \mathop O\limits^{{\delta ^ + }} $$
C. $$\mathop {C{H_2}}\limits^{{\delta ^ - }} = \mathop {CH}\limits^{{\delta ^ + }} - CH = O$$
D. $$\mathop {C{H_2}}\limits^{{\delta ^ + }} = CH - CH = \mathop O\limits^{{\delta ^ - }} $$

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Aldehyde and Ketone


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