A primary amine, `RNH_2` can be reacted with `CH_3-X` to get secondary amine, `R- NHCH_3` but the only disadvantage is that `3^@` amine and quaternary ammonium salts are also obtained as side products. Can you suggest a method where `RNH_2` forms only `2^@` amine ?

How many numbers greater than 40000 can be formed using the digits 1,2,3,4 and 5 if each digit is used only once in each number ?

How many odd numbers greater than 80000 can be formed using the digits 2,3,4,5 and 8 if each digit is used only once in a number ?

How many different 4-digit numbers can he formed from the digits 2, 3, 4 and 6 if each digit is used only once in a number ? Further, how many of these numbers : end in a 3 ?

How many different 4-digit numbers can he formed from the digits 2, 3, 4 and 6 if each digit is used only once in a number ? Further, how many of these numbers : end in a 3 or 6 ?

How many different 4-digit numbers can he formed from the digits 2, 3, 4 and 6 if each digit is used only once in a number ? Further, how many of these numbers : end in a 4 ?

Make up as many expressions with numbers (no variables) as you can, from three numbers 2, 3 and 5. Every number should be used not more than once. Use only addition, subtraction and multiplication. Make the other expressions. 2xx(5-3)

A 0.6gm sample consisting of only CaC_(2)O_(4) and MgC_(2)O_(4) is heated at 500^(@)C gets converted into CaCO_(3) and MgCO_(3) . The sample then weighed 0.465gm. If the sample had been heated to 900^(@)C where the products are CaO and MgO, then what would the mixture of oxides weigh?

Statement-1 (Assertion and Statement- 2 (Reason) Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select the correct choice as given below. Statement - 1 A=[a_(ij)] be a matrix of order 3xx3 where a_(ij) = (i-j)/(i+2j) cannot be expressed as a sum of symmetric and skew-symmetric matrix. Statement-2 Matrix A= [a_(ij)] _(nxxn),a_(ij) = (i-j)/(i+2j) is neither symmetric nor skew-symmetric.

Write IUPAC names of the following compounds and classify them into primary, secondary and tertiary amines. (CH_3)_3CNH_2

Write IUPAC names of the following compounds and classify them into primary, secondary and tertiary amines. (CH_3)_2CHNH_2