Question

The most suitable reagent for the conversion of
$$R - C{H_2} - OH \to R - CHO$$       is:

A. $$KMn{O_4}$$
B. $${K_2}C{r_2}{O_7}$$
C. $$Cr{O_3}$$
D. $$PCC$$  ( Pyridinium Chlorochromate )  
Answer :   $$PCC$$  ( Pyridinium Chlorochromate )
Solution :
An excellent reagent for oxidation of $${1^ \circ }$$ alcohols to aldehydes is $$PCC.$$
\[R-C{{H}_{2}}-OH\xrightarrow{PCC}R-CHO\]

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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