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Aldehydes, Ketones and Carboxylic Acids
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Nucleophilic addition and addition-elimination reactions
JEE Main level
Single correct option
Difficulty 2 of 3
co020
Which order correctly shows increasing reactivity towards nucleophilic addition of
HCN
?
A
CH
X
3
CHO
<
HCHO
<
(
CH
X
3
)
X
3
CCOC
(
CH
X
3
)
X
3
<
CH
X
3
COCH
X
3
B
CH
X
3
COCH
X
3
<
(
CH
X
3
)
X
3
CCOC
(
CH
X
3
)
X
3
<
CH
X
3
CHO
<
HCHO
C
(
CH
X
3
)
X
3
CCOC
(
CH
X
3
)
X
3
<
CH
X
3
COCH
X
3
<
CH
X
3
CHO
<
HCHO
D
HCHO
<
CH
X
3
CHO
<
CH
X
3
COCH
X
3
<
(
CH
X
3
)
X
3
CCOC
(
CH
X
3
)
X
3
Answer: C
Reactivity falls as steric crowding and electron donation by alkyl groups increase. Two bulky tert-butyl groups make the ketone least reactive, followed by acetone, then ethanal, with formaldehyde most reactive.
Practice Aldehydes, Ketones and Carboxylic Acids
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