M.C.Q (1 Marks)

MCQ 11 Mark

Amide which gives propanamine by Hoffmann bromamide is:

✓
Pentanamide
B
Hexanamide
C
Butanamine
D
Propanamine

Answer

Correct option: A.

Pentanamide

In the Hoffmann bromamide reaction, the amine formed has one carbon less than that present in the amide. $\ce{RCONH_2 + Br_2 + 4NaOH} \rightarrow \ce{RNH_2 + Na_2CO_3 + 2NaBr + 2H_2O}$

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MCQ 21 Mark

Lucas reagent is?

A
anhydrous $\ce{PdCl_2}$ and conc $\ce{HCl}.$
B
anhydrous $\ce{AlCl_3}$ and conc $\ce{HCl}.$
C
anhydrous $\ce{CaC_2}$ and conc $\ce{HCl}.$
✓
anhydrous $\ce{ZnCl_2}$ and conc $\ce{HCl}.$

Answer

Correct option: D.

anhydrous $\ce{ZnCl_2}$ and conc $\ce{HCl}.$

"Lucas reagent" is a solution of anhydrous zinc chloride in concentrated hydrochloric acid.

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MCQ 31 Mark

Which of the following reagents would one choose to transform $\ce{CH_3COCI}$ into acetone?

A
$\ce{CH_3MgBr}$
✓
$\ce{(CH_3)_2Cd}$
C
$\ce{(CH_3O)_2Mg}$
D
$\ce{CH_3Cl}$

Answer

Correct option: B.

$\ce{(CH_3)_2Cd}$

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MCQ 41 Mark

For the reaction 3A → 2B, rate of reaction $-\frac{ d [ A ]}{ dt }$ is equal to

A
$\frac{+1}{3} \frac{d[ B ]}{ dt }$
B
$\frac{+2}{3} \frac{d[ B ]}{ dt }$
C
$\frac{+1}{2} \frac{d[ B ]}{ dt }$
✓
$\frac{+3}{2} \frac{d[ B ]}{ dt }$

Answer

Correct option: D.

$\frac{+3}{2} \frac{d[ B ]}{ dt }$

(d) $\frac{+3}{2} \frac{d[ B ]}{ dt }$
Explanation: $\frac{+3}{2} \frac{d[ B ]}{ dt }$

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MCQ 51 Mark

Haemoglobin and chlorophyll contain:

✓
Fe and Mg
B
Fe and Mn
C
Fe and Co
D
Mg and Fe

Answer

Correct option: A.

Fe and Mg

(a) Fe and Mg
Explanation: Haemoglobin contains Fe and Chlorophyll contains Mg.

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MCQ 61 Mark

Ethylidene chloride is $a/an.......$

A
vic$-$dihalide
B
vinylic halide
✓
gem$-$dihalide
D
allylic halide

Answer

Correct option: C.

gem$-$dihalide

Gem$-$dihalides are dihaloalkanes that have two halogen atoms of the same type attached to the same carbon a in a molecule. The common naming system of gem$-$dihalides $($geminal halide$)$ is alkylidene dihalides. Ethylidene dichloride thus is a gem$-$dihalide. The chemical formula of ethylidene dichloride is $\ce{C_3H_6Cl_2}.$

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MCQ 71 Mark

Match the items of column $I$ with appropriate entries of column $II.$

Column $I$	Column $II$
$(a) \ K_b$	$(i)$ Elevation in boiling point
$(b) \ K_f$	$(ii)$ Van't Hoff factor
$(c) \ i$	$(iii)$ Cryoscopic constant
	$(iv)$ Ebullioscopic constant

A
$ \text{(a) - (i), (b) - (ii), (c) - (iii), (d) - (iv)}$
B
$ \text{(a) - (ii), (b) - (i), (c) - (iii), (d) - (iv)}$
C
$ \text{(a) - (iii), (b) - (iv), (c) - (i), (d) - (ii)}$
✓
$ \text{(a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)}$

Answer

Correct option: D.

$ \text{(a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)}$

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MCQ 81 Mark

For the reaction $A + 3B \rightarrow 2C + 2D,$ the concentration of $A$ changes from $0.150 \ M$ to $0.0135 \ M$ in $1$ min. The rate of formation of $C$ in $mol/L/s$ is:

A
$5 \times 10^{5}$
B
$3 \times 10^{-5}$
C
$5 \times 10^{-5}$
✓
$2.5 \times 10^{-5}$

Answer

Correct option: D.

$2.5 \times 10^{-5}$

$ =-\frac{d[A]}{d t}=-\frac{1}{3} \frac{d[B]}{d t}$
$=+\frac{1}{2} \frac{d[C]}{d t}=+\frac{1}{2} \frac{d[D]}{d t}$
$\Rightarrow \frac{d[A]}{d t}=-\frac{1}{2} \frac{d[C]}{d t}$
$\Rightarrow \frac{d[C]}{d t}=2 \frac{d[A]}{d t}$
$=-\frac{2 \times(0.0135-0.0150)}{1 \times 60}$
$=5 \times 10^{-5} mol L^{-1} s^{-1}$
$\text { rate }=5 \times 10^{-5} mol L^{-1} s^{-1}$

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MCQ 91 Mark