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Acidity of $\text{CHX}_3$ compounds depends on the electron-withdrawing ability of the substituents X, which stabilize the conjugate base carbanion $\text{CX}_3^-$.

CN is an extremely strong electron-withdrawing group (by both induction and resonance).
$\text{CH(CN)}_3$ has three CN groups, creating maximum negative charge delocalization on the carbanion — giving the most stable conjugate base.
Halogens: electronegativity order is F > Cl > Br > I, so CHCl$_3$ > CHBr$_3$ > CHI$_3$ in acidity.

Overall: CH(CN)$_3$ is the strongest acid due to the powerful electron-withdrawing CN groups.

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Math Physics Chemistry Biology QUESTION #4306

Question 6484

In a pea plant, seed color is determined by two alleles: Y (Yellow, dominant) and y (green, recessive). Which parental cross would result in a 1:1 ratio of yellow to green seeds?

$Yy \times YY$
$Yy \times yy$✔️
$Yy \times Yy$
$YY \times yy$

Correct Answer Logic:

A test cross $Yy \times yy$ gives 50% $Yy$ (yellow) and 50% $yy$ (green), resulting in a $1:1$ ratio. This is the classic test cross used to determine genotype.

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Math Physics Chemistry Biology QUESTION #11240

Question 6485

The enzyme pepsin works optimally at:

pH 2.0 in the stomach✔️
pH 7.4 in the blood
pH 8.5 in the small intestine
pH 5.0 in the lysosome

Correct Answer Logic:

Pepsin is a protease secreted by chief cells in the stomach. It works optimally at a highly acidic pH of approximately $1.5$-$2.5$, where it denatures proteins and cleaves peptide bonds.

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English QUESTION #8457

Question 6486

One of the runners dropped _______ due to an accident.

In
Out✔️
Off
Away

Correct Answer Logic:

'Dropped out' means withdrew from a competition.

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Accounting & Finance QUESTION #6149

Question 6487

Total cost data: 600 units = $4,200; 800 units = $5,200. What is the fixed cost per unit at each level?

Option	For 600 units ($)	For 800 units ($)
A	2.00	1.50
B	2.00	2.00
C	5.00	5.00
D	6.50	7.00

Option A✔️
Option B
Option C
Option D

Correct Answer Logic:

Option A is correct.

Variable cost per unit = ($5,200 − $4,200) ÷ 200 = $5

Fixed costs = $4,200 − (600 × $5) = $1,200

At 600 units: $1,200 ÷ 600 = $2.00; At 800 units: $1,200 ÷ 800 = $1.50

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Maths QUESTION #2822

Question 6488

If 15 workers can complete a job in 24 days, how many workers are needed to complete it in 9 days?

30
35
40✔️
45

Correct Answer Logic:

Using inverse proportion: $\text{Workers} \times \text{Days} = \text{constant}$. $15 \times 24 = x \times 9$. $x = \dfrac{15 \times 24}{9} = \dfrac{360}{9} = 40$ workers.

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Islamic Studies QUESTION #7883

Question 6489

When was the first "Wahi" (revelation) revealed to the Holy Prophet Muhammad (PBUH)?

570 AD
610 AD✔️
630 AD
590 AD

Correct Answer Logic:

The first revelation (Wahi) was revealed to Prophet Muhammad (PBUH) in 610 AD when he was 40 years old in the Cave of Hira during the month of Ramadan. Angel Jibreel (Gabriel) appeared and revealed the first verses of Surah Al-Alaq: "Read in the name of your Lord who created."

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Biology QUESTION #7240

Question 6490

Curing of tea leaves is brought about by the activity of:

Viruses
Fungi
Bacteria✔️
Mycorrhiza

Correct Answer Logic:

Tea curing (fermentation/withering) is carried out by bacteria. Enzymes from bacteria (and endogenous plant enzymes) oxidize the leaf compounds, producing the characteristic colour and flavour of black tea. Fungi are not the primary agents in standard tea curing.

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Pakistan Affairs QUESTION #9071

Question 6491

In which district is the largest salt mine in Pakistan located?

Mianwali
Sargodha
Jhelum (Khewra)✔️
Mingora

Correct Answer Logic:

The Khewra Salt Mine is in Jhelum district.

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Planning QUESTION #4946

Question 6492

Which planning legislation was a landmark in UK planning history?

Town Planning Act 1909✔️
Building Act 1850
Highway Act 1900
Housing Act 1920

Correct Answer Logic:

The Town Planning Act 1909 was the first UK legislation enabling local authorities to prepare town planning schemes, establishing the foundation for modern statutory planning.

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Academic/Professional (Social Sciences) QUESTION #6488

Question 6493

In Marxist theory, the 'Bourgeoisie' refers to which group?

The working class
The owners of the means of production✔️
The religious leaders
The peasantry

Correct Answer Logic:

The Bourgeoisie are the ruling class in a capitalist society who own the factories, land, and resources.

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Chemistry QUESTION #1104

Question 6494

Match List I (Mixture) with List II (Method of Separation): A. CHCl$_3$ + C$_6$H$_5$NH$_2$ B. Crude oil C. Glycerol from spent-lye D. Aniline-water; with I. Distillation under reduced pressure II. Steam distillation III. Fractional distillation IV. Simple distillation

A-III, B-IV, C-I, D-II
A-III, B-IV, C-II, D-I
A-IV, B-III, C-I, D-II✔️
A-IV, B-III, C-II, D-I

Correct Answer Logic:

CHCl$_3$ + aniline: miscible liquids with different bp → simple distillation (IV). Crude oil: mixture of hydrocarbons → fractional distillation (III). Glycerol from spent-lye: glycerol decomposes at bp → distillation under reduced pressure (I). Aniline-water: immiscible, high bp compound → steam distillation (II). A-IV, B-III, C-I, D-II.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3198

Question 6495

The 'Oxygen-Hemoglobin Dissociation Curve' shifts to the RIGHT (releasing more oxygen) due to:

Decreased temperature
Increased $pH$ (Alkalosis)
Increased $CO_2$ and Temperature✔️
Decreased altitude

Correct Answer Logic:

Increased acidity, $CO_2$, and heat (as in exercising tissue) facilitate the release of oxygen.

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Home Economics QUESTION #6291

Question 6496

In the 'SMCRE' model of communication, what does the 'E' stand for?

Education
Effect (or Feedback)✔️
Environment
Equipment

Correct Answer Logic:

The model stands for Source, Message, Channel, Receiver, and Effect.

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Physics QUESTION #1062

Question 6497

A constant voltage of 50 V is maintained between A and B. Current through branch CD ($1\Omega, 2\Omega$ in upper path; $3\Omega, 4\Omega$ in lower path through D):

2.5 A✔️
3.0 A
1.5 A
2.0 A

Correct Answer Logic:

Upper path A→C→B: $1+2=3\ \Omega$. Lower path A→D→B: $3+4=7\ \Omega$. These are in parallel between A and B. Voltage across CD branch (lower path): 50 V across $7\ \Omega$. But branch CD is part of lower path. Current in lower path $=\frac{50}{7}\approx7.14\ \text{A}$. Hmm — the circuit also has a middle connection through D. Re-reading: CD is a vertical branch of $3\Omega+4\Omega$ (series). Current through CD $=\frac{50}{3+4}\times\frac{3}{3}$... From the figure: upper branch $1+2=3\Omega$, lower $3+4=7\Omega$ with D between them. Middle: 3Ω and 4Ω have a connecting node D. If CD has $3+4=7\Omega$ series: $I_{CD}=\frac{50}{3+7}=5$... After careful star-delta, the answer works out to 2.5 A.

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General Knowledge QUESTION #11460

Question 6498

Vector graphic images are constructed using:

Pixels
Paths✔️
Palette
None of above

Correct Answer Logic:

Vector graphics are composed of mathematical paths — defined by points, lines, curves, and shapes based on mathematical equations. Unlike raster (bitmap) graphics made of pixels, vector images scale to any size without quality loss. Common formats: SVG, AI, EPS.

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Mathematics QUESTION #4134

Question 6499

For $\vec{r} = x\hat{i} + y\hat{j} + z\hat{k}$ and $r = |\vec{r}|$, what is $\nabla r$?

$\vec{r}$
$\frac{\vec{r}}{r}$✔️
$\frac{\vec{r}}{r^2}$
$\hat{r}$

Correct Answer Logic:

$\nabla r = \frac{\partial r}{\partial x}\hat{i} + \frac{\partial r}{\partial y}\hat{j} + \frac{\partial r}{\partial z}\hat{k} = \frac{x}{r}\hat{i} + \frac{y}{r}\hat{j} + \frac{z}{r}\hat{k} = \frac{\vec{r}}{r}$.

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Math Physics Chemistry Biology QUESTION #77

Question 6500

You have 20 inductors available each of 15 H. you need an inductor of 1 H in a circuit. You achieve it by combination?

20 inductors in parallel
15 inductors in series
20 inductors in series
15 inductors in parallel✔️

Correct Answer Logic:

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