KCET · Chemistry · Amines
On heating with concentrated \( \mathrm{NaOH} \) solution in an inert atmosphere of \( \mathrm{CO}_{2} \), white
phosphorous gives a gas. Which of the following statement is incorrect about the gas?
- A It is less basic than \( \mathrm{NH}_{3} \)
- B It is more basic than \( \mathrm{NH}_{3} \).
- C It is highly poisonous and has smell like rotten fish.
- D It's solution in water decomposes in the presence of light.
Answer & Solution
Correct Answer
(B) It is more basic than \( \mathrm{NH}_{3} \).
Step-by-step Solution
Detailed explanation
\( \mathrm{P}_{4}+3 \mathrm{NaOH}+3 \mathrm{H}_{2} \mathrm{O}-\stackrel{\Delta}{\mathrm{CO}_{2}}>3 \mathrm{~N} a \mathrm{H}_{2} \mathrm{PO}_{2}+\mathrm{PH}_{3} \uparrow \) (phosphine)
\( \mathrm{PH}_{3} \) is less basic than \( \mathrm{NH}_{3} \) because lone pairs of electrons are less available in \( \mathrm{PH}_{3} \) and \( \mathrm{NH}_{3} \) due to larger size of
the phosphorous than nitrogen.
\( \mathrm{PH}_{3} \) is less basic than \( \mathrm{NH}_{3} \) because lone pairs of electrons are less available in \( \mathrm{PH}_{3} \) and \( \mathrm{NH}_{3} \) due to larger size of
the phosphorous than nitrogen.
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Chemistry
- Ethanol is converted into ethoxy ethane,KCET 2016 Medium
- Which of the following is least soluble in water at \( 298 \mathrm{~K} ? \)KCET 2019 Medium
- In the reaction between hydrogen sulphide and acidified permanganate solution,KCET 2025 Medium
- Ethyl benzene cannot be prepared byKCET 2011 Medium
- Ethyl alcohol is heated with concentrated sulphuric acid at 413 K . The major productKCET 2025 Easy
- A pair of isoelectronic species having bond order of one isKCET 2024 Medium
More PYQs from KCET
- If \( 21^{\text {st }} \) and \( 22^{\text {nd }} \) terms in the expansion of \( (1+x)^{44} \) are equal, then \( x \) is equal toKCET 2014 Easy
- A paramagnetic sample shows a net magnetisation of \(8 \mathrm{Am}^{-1}\) when placed in an external magnetic field of \(0.6 \mathrm{~T}\) at a temperature of \(4 \mathrm{~K}\). When the same sample is placed in an external magnetic field of \(0.2 \mathrm{~T}\) at a temperature of \(16 \mathrm{~K}\), the magnetisation will beKCET 2020 Medium
- The diagram given below represents the history of a striped muscle. Label the parts A, B, C, D, E and F.
KCET 2011 Easy - An electron of mass \( \mathrm{m} \), charge e falls through a distance \( \mathrm{h} \) meter in a uniform electric field \( \mathrm{E} \). Then time of fallKCET 2016 Medium
- 'Hydraulic lift' works on the basis ofKCET 2017 Easy
- During a \(\beta^{-}\)-decayKCET 2020 Medium