A carbonyl compound P, which gives positive iodoform test, undergoes reaction with MeMgBr followed by dehydration to give an olefin Q. Ozonolysis of Q leads to a dicarbonyl compound R, which undergoes intramolecular aldol reaction to give predominantly S.

The structures of the products Q and R, respectively, are:

Consider the following reactions I and II,
I)
II)
Products 'X' and 'Y' are respectively:

In which of the following cases, the nitration will take place at meta-position?
I)
II)
III)
IV)

The correct order of decreasing basicity of the following compounds is:
I)
II)
III)
IV)

Phenol . gives two polymers on condensation with formaldehyde:

X and Y are :

X and Yare:

Simplify : 2m-3 =17

In the figure is shown Young’s double slit experiment. Q is the position of the first bright fringe on the right side of O. P is the 11^th fringe on the other side, as measured from Q. If the wavelength of the light used is , then will be equal to

When one of the slits of Young’s experiment is covered with a transparent sheet of thickness 4.8 mm, the central fringe shifts to a position originally occupied by the 30^th bright fringe. What should be the thickness of the sheet if the central fringe has to shift to the position occupied by 20^th bright fringe

Figure here shows P and Q as two equally intense coherent sources emitting radiations of wavelength 20 m. The separation PQ is 5.0 m and phase of P is ahead of the phase of Q by 90^o. A, B and C are three distant points of observation equidistant from the mid-point of PQ. The intensity of radiations at A, B, C will bear the ratio

Represent -7 + 3 on number line

When we add something to the given number, we don’t start counting the second number from zero. We count the places from the number itself. Any negative value means we move in left direction. Any positive value means we move in right direction.

Statement-I:
Statement-II: If 0<a<b, then

Statement-I:
Statement-II: If a>0, a>b, then

Statement-I:
Statement-II: If a>b then

Statement-I:
Statement-II: If a<b then