Q. The structure of isobutyl group in an organic compound is

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A

$CH_{3}-\overset{\left|\right.}{C H}-CH_{2}-CH_{3}$

B

$CH_{3}-CH_{2}-CH_{2}-CH_{2}-$

C

$\left(\right.CH_{3}\left(\left.\right)_{3}C-$

D

$\left(\right.CH_{3}\left(\left.\right)_{2}CH-CH_{2}-$

Solution:

$CH_{3}-\overset{\left|\right.}{C H}-CH_{2}-CH_{3}$ (Secondary butyl)
$CH_{3}-CH_{2}-CH_{2}-CH_{2}-$ (Normal butyl)
$\left(\right.CH_{3}\left(\left.\right)_{3}C-$ (Tertiary butyl)

Questions from NTA Abhyas 2022

1. An alkene $\left(\right.A\left.\right)$ on ozonolysis gives a mixture of two carbonyl compounds. Mixture on Clemmensen reduction gives just one alkane $\left(\right.B\left.\right)$ . $\left(\right.B\left.\right)$ is the lowest alkane which in pure form can not be prepared by standard Wurtz method. $\left(\right.A\left.\right)$ is

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5. The density of 2 M aqueous solution of NaOH is 1.28 g/cm$^3$. The molality of the solution is
[Given that molecular mass of NaOH = 40 g mol$^{-1}$]

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