JEE PYQ: Aldehydes And Ketones Question 14
Question 14 - 2020 (03 Sep Shift 2)
Increasing order towards HCN addition: (i) $p$-methoxybenzaldehyde, (ii) $o$-nitrobenzaldehyde, (iii) $o$-methoxybenzaldehyde, (iv) $m$-nitrobenzaldehyde
(1). ((i) < (iii) < (iv) < (ii))
(2). ((iii) < (iv) < (i) < (ii))
(3). ((iii) < (i) < (iv) < (ii))
(4). ((iii) < (iv) < (ii) < (i))
Show Answer
Answer: (3)
Solution
$-\text{I}$ effect of NO$_2$ increases reactivity towards nucleophilic addition. $-\text{OCH}_3$ is electron donating (decreases reactivity). $o$-nitro > $m$-nitro. $o$-methoxy has steric hindrance.
BETA
