JEE Main 2026 — Jan 21, Shift 2 — Chemistry solution

JEE Main2026Jan 21, Shift 2Chemistry

Given below are four compounds:

(a) n-propyl choride

(b) iso-propyl chloride

(d) neo-pentyl chloride

Percentage of carbon in the one which exhibits optical isomerism is:

A
52
B
56
C
46
D
40

Solution

Identify the chiral one: only sec-butyl chloride (2-chlorobutane, $C H_{3} C H C l - C H_{2} C H_{3}$ ) has a stereocentre at C-2; the other three lack four distinct groups on any carbon.

Molecular formula $C_{4} H_{9} C l$ , molar mass $= 4 (12) + 9 (1) + 35.5 = 92.5$ g/mol. Mass of C $= 48$ .

$% C = \frac{48}{92.5} \times 100 \approx 51.89% \approx 52%$ .

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