Aldehydes Ketones and Carboxylic Acids - JEE Main 2015 by ednexa.com

1. Aldehydes Ketones and Carboxylic Acids
Exercise
Q.1 A ketone group can be present
(a) in between carbon chain
(b) only at the end of carbon chain
(c) at any place in carbon chain
(d) only at the second carbon atom of carbon chain
Q.2 Carbon of carbonyl compound is …… hybridized and makes the bond angle with −R and =O is…..
(a) sp, 180º
(b) sp2, 120º
(c) sp2, 90º
(d) sp3, 120º
Q.3 Aldehyde may be defined as
(a) an organic compound containing −CHO group
(b) first oxidation product of primary alcohol
(c) first oxidation product of secondary alcohol
(d) both (a) and (b)
Q.4 Acetone is
(a) Symmetrical ketone
(b) Carboxylic acid
(c) Mixed ketone
(d) Asymmetric ketone
Q.5 Aldehydes and ketones are

2. (a) Optical isomers
(b) Chain isomers
(c) Functional isomers
(d) Position isomers
Q.6 Metaldehyde is …… form of aldehyde.
(a) trimer
(b) tetramer
(c) monomer
(d) dimer
Q.7 The IUPAC name of the following compound will be
3 2 2
3
CH CH CH CH CH CHO
| |
OH CH
    
(a) 3-hydroxy-2-phenyl-hexanal
(b) 1-hydroxy-2-ethyl-hexanal
(c) 2-hydroxy-4-methyl-pentanal
(d) 4-hydroxy-2-methyl-hexanal
Q.8
3 2
OH
|
CH CHCH CHO
is acetaldol, it is named as
(a) α-hydroxy butyraldehyde
(b) β-hydroxy butyraldehyde
(c) β-hydroxy acetaldehyde
(d) diacetone alcohol
Q.9 The IUPAC name of the compound C2H5−CHOH−CHCH3−CHO is
(a) 3-hydroxy pentanal
(b) 2-hydroxy-3-methyl pentanal
(c) 3-hydroxy-2-methyl pantanal

3. (d) 4-hydroxy pentanal
Q.10 On heating a mixture of calcium formate and calcium propanoate,
compound obtained is
(a) propanal
(b) propanoic acid
(c) propanone
(d) propane
Answer key:
1-a 11-c 21-d
2-b 12-b 22-c
3-d 13-a 23-b
4-a 14-d 24-a
5-c 15-d 25-d
6-b 16-c
7-d 17-a
8-b 18-b
9-c 19-c
10-a 20-d
#Solution#
#1#
 
O
||
Ketonic group C is divalent.
#8#
CH3 CH CH2 CHO
|
OH
 
  
#10#  2  3 2 2 3 2 3
HCOO Ca CH CH COO Ca 2CH CH CHO 2CaCO
Propanal
   
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