thanks. i understood when i converted it to saw horse projection.

yes morrison boyd is very useful, actually i use O.P agarwall and morrison boyd for organic chemistry. M.B helps strengthening the concepts. If u want to look at more problems, use Arihant.  is peter sykes good? i have not come acrtoss it.

Hi,

 

When treated with C2H5OK in C2H5OH, diastereomer A (and its enantiomer) give cis-2-butene without loss of deuterium and trans-2-butene with loss of deuterium. Diastereomer B (and its enantiomer) gave trans-2-butene without loss of deuterium. What is the stereochemistry of elimination here, which accounts for the findings?

 

 

                   A                              B

Hi,

 

I am doing my 12th now, preparing for the JEE. I have enrolled in fiitjee clasroom prog for the same. What should I do extra for aieee? arent the syllabus the same? can someone give a detailed plan for aieee preparation? (like when i should start sudying for it)

i did the same thing too.. maybe the book answer is wrong or maybe we are missing something

the question is from JPNP (IIT physics) book

Hi,

 

This is a question from H.C verma page 273 (vol 1), obj II , q 2

 

The weight of an empty balloon on a spring balance is W1, the weight becomes

W2 when the balloon is filled with air. Let the weight of the air itself be w. Neglect the thickness of the balloon when it is filled with air. Also neglect the difference in the densities of the air inside and outside the balloon.

 

(A) W2=W1

(B) W2=W1+w

(C) W2<W1+w

(D) W2>W1

 

please explain the answer.

A flask containing air at 7degree celcius at atmospheric pressure is corked up. A pressure of 2.5 atmospheres inside the flash would force the cork out. The temperature at which it will happen is:

 

(A) 67.5C

(B) 75K

(C) 57.7C

(D) 670 C

 

Hi,

 

A tube of length h, which is wide enough to make surface tension effects negligible, is closed at one end. It is then lowered into a tank of mercury to a depth of 'h' as shown so that the mercury rises a distance 'x' into the tube. If the mercury barometer stands at 'h' also, then

 

(A) (2h-x)(h-x) = h²

(B) (2h-x)(h+x)=h²

(C) h(h-x)=h²

(D) 2h(h-x)=h²

 

 

If P(-3,2) is one end of the focal chord PQ of the parabola y²+ 4x + 4 =0, then the slope of the normal at Q is

 

(A) -1/2

(B) 2

(C) 1/2

(D) -2

 

Solution: A

Hi,

 

A metal cube is placed in an empty vessel. When water is filled in the vessel so that the cube is completely immersed in the water, the force on the bottom of the vessel in contact with the cube

 

(A) will increase

(B) will decrease

(C) will remain the same

(D) will become zero.

 

[Solution: C]

please explain.

Hi,

 

A closed cubical box is completely filled with water and is accelerated horizontally towards right with an acceleration 'a'. The resultant normal force by the water on the top of the box

 

(A) passes through the centre of the top

(B) passes through a point to the right of the centre

(C) passes through a point on the left of the centre

(D) becomes zero.

 

Can you please explain the answer?

Hi,

 

The three vessels shown in the figure have the same base area. Equal volumes of a liquid are poured in the three vessels. The force on the base will be

 

(A) Maximum in the first Vessel

(B) Maximum in the second vessel

(C) Maximum in the third vessel

(D) equal in all vessels.

 

 

My doubt is.. Will any force act on the base due to the weight of the fluid or will the force be only due to the pressure?