1
JEE Main 2023 (Online) 6th April Evening Shift
Numerical
+4
-1
Change Language

Among the following, the number of compounds which will give positive iodoform reaction is _________

(a) 1-Phenylbutan-2-one

(b) 2-Methylbutan-2-ol

(c) 3-Methylbutan-2-ol

(d) 1-Phenylethanol

(e) 3,3-dimethylbutan-2-one

(f) 1-Phenylpropan-2-ol

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2
JEE Main 2023 (Online) 6th April Evening Shift
Numerical
+4
-1
Out of Syllabus
Change Language

Number of crystal systems from the following where body centred unit cell can be found, is ____________.

Cubic, tetragonal, orthorhombic, hexagonal, rhombohedral, monoclinic, triclinic

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3
JEE Main 2023 (Online) 6th April Evening Shift
Numerical
+4
-1
Change Language

Consider the following pairs of solution which will be isotonic at the same temperature. The number of pairs of solutions is / are ___________.

A. $$1 ~\mathrm{M}$$ aq. $$\mathrm{NaCl}$$ and $$2 ~\mathrm{M}$$ aq. urea

B. $$1 ~\mathrm{M}$$ aq. $$\mathrm{CaCl}_{2}$$ and $$1.5 ~\mathrm{M}$$ aq. $$\mathrm{KCl}$$

C. $$1.5 ~\mathrm{M}$$ aq. $$\mathrm{AlCl}_{3}$$ and $$2 ~\mathrm{M}$$ aq. $$\mathrm{Na}_{2} \mathrm{SO}_{4}$$

D. $$2.5 ~\mathrm{M}$$ aq. $$\mathrm{KCl}$$ and $$1 ~\mathrm{M}$$ aq. $$\mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}$$

Your input ____
4
JEE Main 2023 (Online) 6th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

If the coefficient of $${x^7}$$ in $${\left( {a{x^2} + {1 \over {2bx}}} \right)^{11}}$$ and $${x^{ - 7}}$$ in $${\left( {ax - {1 \over {3b{x^2}}}} \right)^{11}}$$ are equal, then :

A
$$243ab = 64$$
B
$$32ab = 729$$
C
$$64ab = 243$$
D
$$729ab = 32$$
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