MCQ
Propanal on treatment with dilute sodium hydroxide forms
- A$CH_3CH_2CH_2CH_2CH_2CHO$
- B$CH_3CH_2CH(OH)CH_2CH_2CHO$
- ✓$CH_3CH_2CH(OH)CH(CH_3)CHO$
- D$CH_3CH_2COONa$
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where $x$ and $y$ are in $m$ and $t$ is in $s$. The length of the string is $1.5\, m$ and its mass is $3.0 \times 10^{-2} \,kg$, then tension in string is ..... $N$



Assertion $A$ : If $dQ$ and $dW$ represent the heat supplied to the system and the work done on the system respectively. Then according to the first law of thermodynamics $d Q=d U-d W$.
Reason $R :$ First law of thermodynamics is based on law of conservation of energy.
In the light of the above statements, choose the correct answer from the option given below :
