An optically active substance, A, decomposes into optically active substances 'B' and 'C' as: A \stackrel{K=0.001 \min ^{-1}\xrightarrow} 2 B+C The specific rotations of {A}, {B} and {C} are +40^{\circ},+10^{\circ} and -30^{\circ} per mole, respectively. If initially {A} and C were present in 4: 3 mole ratio, the time (in min), after which the sample becomes optically inactive, is (\ln 2=0.7, \ln 5=1.6, \ln 7=2.0, \ln 13=2.5)

JEE Advanced 2020 Full Test 2 Paper 1

Question : 31 of 54

Marks: +1, -0

An optically active substance, A, decomposes into optically active substances 'B' and 'C' as:
A

K=0.001min−1

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2B+C The specific rotations of A,B and C are +40∘,+10∘ and −30∘ per mole, respectively. If initially A and C were present in 4: 3 mole ratio, the time (in min), after which the sample becomes optically inactive, is (ln‌2=0.7,ln‌5=1.6,ln‌7=2.0,ln‌13=2.5)

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