If amines are arranged in increasing order of their basic strength in gaseous phase, the correct order will be:
Inductive effect increases basicity.
NH₃ < CH₃NH₂ < (CH₃)₃N < (CH₃)₂NH
NH₃ < (CH₃)₂NH < (CH₃)₃N < CH₃NH₂
(CH₃)₃N < (CH₃)₂NH < CH₃NH₂ < NH₃
NH₃ < CH₃NH₂ < (CH₃)₂NH < (CH₃)₃N
Basicity increases with more alkyl groups due to the +I effect in gaseous phase.



A ladder of fixed length \( h \) is to be placed along the wall such that it is free to move along the height of the wall.
Based upon the above information, answer the following questions:
(iii) (b) If the foot of the ladder, whose length is 5 m, is being pulled towards the wall such that the rate of decrease of distance \( y \) is \( 2 \, \text{m/s} \), then at what rate is the height on the wall \( x \) increasing when the foot of the ladder is 3 m away from the wall?